Simone Biles mixed brilliance with an unfamiliar touch of the erratic as she launched into Tokyo 2020 action, just about keeping alive the prospect of beating her Rio haul of four gold medals.

The American gymnastics great headed the all-around individual standings, just ahead of the impressive Brazilian Rebeca Andrade, with USA team-mate Sunisa Lee in third.

She remains in the hunt in six events, but it was far from a dominant Biles at the Ariake Gymnastics Centre, and the United States team as a whole had an unusually mediocre day. The Russian Olympic Committee gymnasts finished above them in the team standings for the first time since 2010 at a major event.

Russia's score of 171.629 suggested they can post a major challenge in the final to the usually dominant United States (170.562), although Biles and her team-mates will want to prove themselves once again.

Since 2011, the USA have won team gold at all five World Championships and both Olympic Games, in London and Rio.

Biles' landings were not near as sure-footed as they have so typically been, and in her floor exercise she misjudged a tumbling pass to such an extent she stepped back all the way off the raised floor.

Tom Forster, high performance co-ordinator for the USA, was taken aback by Biles' mistakes.

He said: "That was a surprise. She's been incredibly consistent and I'm sure she feels bad, but I'm super proud of the way she trained.

"She's been a great leader for us. Sometimes, just like in other sports, great athletes drop the ball in the end zone or a quarterback throws an interception. It happens. Those steps are mental errors."

At one point it appeared Biles might miss out on the eight-woman final of the uneven bars, but she squeezed in, benefiting from the rule that allows only two athletes from each nation in the final. Biles finished 10th in qualifying, but four Russian competitors were ahead of her, with two of those unable to advance.

It means she remains in the hunt for titles in all six of her events, including the team competition, for which Forster will look to ensure Biles and her team-mates are thoroughly prepared.

"Staying in bounds would help. Simone took three big steps on her beam dismount. I've never seen her do that before," Forster said.

The challenge of the Russian team could lift the Americans, or it could point to a changing of the guard at the top of women's gymnastics.

Forster is only looking to the former, saying: "This might be a great awakening for us, and we'll take advantage of it."

While 24-year-old Biles battles to recover peak form in time for Tuesday's team final, Olympic veteran Oksana Chusovitina has reached the end of the road in her Games career.

Competing at her eighth Olympics, the 46-year-old took part in the vault but failed to qualify for the final.

Chusovitina, who has previously competed for the Soviet Union and Germany and made her Games debut in 1992, was back representing her native Uzbekistan in Tokyo and received an ovation from her rivals after producing two valiant vaults.

"It was really nice. I cried tears of happiness because so many people have supported me for a long time," she said of the recognition.

"I feel very proud and happy. I'm saying goodbye to sports. It's kind of mixed feelings. I'm alive, I'm happy, I'm here without any injuries, and I can stand on my own."

China remain top of the medal table at the Tokyo Olympics after an eventful round of action on Sunday that saw the United States and hosts Japan enjoy a golden day.

Having picked up four medals on the first full day of action, China added to their haul with three more golds, one silver and three bronze.

Two of China's golds came in weightlifting, with Li Fabin and Chen Lijun coming out on top in the men's 61kg and men's 67kg, followed by success in the women's synchronised 3m springboard final.

A lot is expected of hosts Japan at these Games and they picked up four golds on Sunday, two of those in judo through Hifumi Abe and Uta Abe.

Yuto Horigome made history by winning the first gold in the men's street skateboarding, while Yui Ohashi finished first in the women's 400m individual medley swimming event.

The United States failed to pick up a medal on the opening day of the Games for the first time since Munich 1972, but they stormed back into contention with 10 medals on Sunday.

That included a gold for Lee Kiefer, who became the first American fencer to win a gold medal in individual foil.

William Shaner and Chase Kalisz prevailed in the men's 10m air rifle and 400m individual medley swimming, meanwhile, and Anastasija Zolotic took taekwondo gold in the women -57kg.

Behind China, Japan and USA in the medal table is South Korea, who doubled their tally of golds thanks to victory in the women's team archery.

Austria, France, Tunisia, Uzbekistan, Australia and the Russian Olympic Committee also got off the mark with their first golds of the delayed 2020 Games on Sunday.

Keyshawn Davis has his sights trained on gold after dominating his first Olympic fight, while Charley Davison wants a "Battle of the Super Mums" with Mary Kom in Tokyo.

American Davis earned a unanimous decision in his lightweight (57-63kg) round-of-32 bout with Dutchman Enrico Lacruz at the Kokugikan Arena and declared that was just the start.

Team GB fighter Davison is eyeing a clash with fellow mother Kom, a superstar of the sport, after coming through her first Olympic fight.

Boxing action at the Games on Sunday certainly delivered on its promise.

DAVIS: GOLD IS ALL I'M MISSING

Davis won all three rounds in his debut Olympic bout against Lacruz of the Netherlands and is determined to become the youngest winner of this event since Oscar de la Hoya was crowned champion aged 19 in 1992.

He said: "I feel great, I got a unanimous decision on my Olympic debut. I felt like I could have given more, but I did what I had to do.

"In my previous competitions, especially in the amateurs, each day I got better and better, got more in the groove. Today was just the start and there is more to come."

The 22-year-old added: "The gold medal is the one and only thing that I need to put on my resume as of right now. That's the only thing I am focusing on."

DAVISON TARGETS MOTHER OF ALL FIGHTS

Davison only joined the Great Britain Olympic programme last year as a mother of three and beat Morocco's Rabab Cheddar on points in her maiden Olympic fight.

The 27-year-old flyweight would relish the chance to step into the ring with Indian mother of four Kom, the 38-year-old six-time World Championship gold medallist who is in her half of the draw and made it through to the last 16.

Asked about the prospect of that fight taking place, she said: "We were only taking about that earlier. What a fight that would be, the 'Battle of the Super Mums'. I'd love that.

"I know her background, and she is a brilliant athlete who has done so well in the sport. She was the first one to do it as a mum, so I'm basically following on from her."

NAKIMI IN THE HUNT TO EMULATE ADAMS

Japan's Tsukimi Namiki beat Catherine Nanziri on points in the women's flyweight (48-51kg) round of 32.

Namiki, a bronze medallist at the 2018 World Championships, had the better of all three rounds of her fight with Ugandan Nanziri.

Nicola Adams is the only female boxer to win an Olympic medal on home soil, with gold in London nine years ago, but Namiki could also achieve that feat.

The United States saw a 25-game winning streak in men's basketball at the Olympics come to an end as they were beaten by France in their first outing at Tokyo 2020.

Team USA arrived in Japan looking to strike gold for a fourth straight Games, yet their build-up had been anything but straightforward. Exhibition defeats to Australia and Nigeria raised concerns before travelling, while COVID-19 protocols ruled out Bradley Beal and Kevin Love was replaced at late notice by JaVale McGee.

Still, a squad including Kevin Durant, Damian Lillard and Jayson Tatum – as well as Khris Middleton and Jrue Holiday from the Milwaukee Bucks, the newly crowned NBA champions – saw the reigning champions listed as favourites.

France, though, caused an early upset at the start of the tournament. Evan Fournier starred with 28 points to help his team triumph 83-76 at the Saitama Super Arena.

There were wins for Australia and Italy too on Sunday, as well as a victory for the Czech Republic.

Big names come up short in shock defeat

Team USA had rounded out their build-up to the Games by beating Spain, yet there will be concerning signs for head coach Gregg Popovich following a flat performance against France.

They were successful with just 41 per cent of their two-point attempts and landed only 10 of the 32 shots put up from beyond the arc. Despite the shooting issues they still led 45-37 at half-time, only for the game to turn in a third quarter where they mustered a paltry 11 points.

Durant finished up with 10 points on 4-of-12 shooting, while Lillard had 11. The latter's slip that caused a turnover in the closing seconds when down by four rather summed up a disjointed performance from the entire roster, leading to a first loss at the Olympics since going down to Argentina at Athens 2004.

Devin Booker, who had helped the Phoenix Suns reach the NBA Finals, landed only one of his six attempts from the field, with Holiday (18 points) finishing as the USA's leading scorer having only joined up with the team on the day of the game.

Also in Group A, the Czech Republic recorded an 84-78 victory over Iran.

Ingles impressed, but Nigeria come up short

Nigeria had defeated both Argentina and the United States ahead of the Games, raising hopes of making an impact in Japan.

However, able to knock down just 29 per cent of their attempts from deep, they struggled to keep pace with Australia, scoring only 27 points in the entire second half as they went down 84-67.

Still, Joe Ingles – who had 11 points for Australia – praised the Nigerians for their display, particularly on defense as they forced 21 turnovers. Patty Mills was the leading scorer in the game, finishing with 25.

"You have to give a lot of credit to Nigeria, with how they played and the style they play," Ingles said. "They are up and in, they are athletic and get up the floor, and they obviously have a great coach [in Mike Brown].

"I think a lot of people underestimate the team and the country. They are a really good basketball team."

Meanwhile, Italy opened their Group B campaign with a 92-82 victory over Germany. Simone Fontecchio led the way with 20 points, including landing all five of his three-point attempts.

France got the better of South Africa in a seven-goal thriller as Andre-Pierre Gignac's hat-trick inspired Les Bleus to a 4-3 victory at the Tokyo Olympics.

Having been thrashed 4-1 by Mexico in their opening game of Group A, France hit back to keep their chances of progression alive, though they had to do so the hard way in Saitama.

Indeed, South Africa led on three occasions during a remarkable second half, yet it was Les Bleus who took the points.

Liberato Cacace's stunner was not enough to propel New Zealand to victory against Honduras in Group B, while reigning champions Brazil could only draw 0-0 with the Ivory Coast and Spain overcame Australia thanks to Mikel Oyarzabal's late winner.

GIGNAC AND SAVANIER SETTLE THRILLER

France were on the wrong end of conceding four last time out, and though they still let three in this time around, Teji Savanier's stoppage-time goal saw them clinch victory.

It was 35-year-old Gignac who had previously dragged France level on three occasions – a close-range finish followed by a thumping header before the Tigres striker, the leading scorer in the competition, converted his second penalty of the tournament to cancel out Teboho Mokoena's glorious 81st-minute strike.

Luther Singh had missed a first-half penalty for South Africa, with Kobamelo Kodisang and Evidence Makgopa also getting on the scoresheet.

But Gignac's efforts set the stage for France to nose themselves ahead when Montpellier's experienced Savanier lashed home, sending South Africa out in the process.

France sit third in Group A, three points behind leaders Japan, who survived a late scare to beat Mexico 2-1.

ALL WHITES LET LEAD SLIP

Cacace's exceptional strike put New Zealand ahead after just 10 minutes in Kashima – the defender picking out the top-right corner with a first-time effort from 30 yards out.

Luis Palma restored parity in first-half stoppage time, yet Chris Wood carried on his scoring form to put New Zealand back in front just after the restart.

Yet substitutes proved the difference for Honduras. Juan Obregon netted with 12 minutes remaining, paving the way for Rigoberto Rivas to clinch the comeback victory.

Matters were much more simple for South Korea, as they cruised to a 4-0 triumph against Romania, meaning all four Group B teams are on four points heading into the final matchday.

OYARZABAL RECORDS LONG-AWAITED SPAIN WIN

Spain secured their first win at an Olympic Games since 2000 thanks to Oyarzabal's header against Australia, which came with nine minutes of normal time remaining.

The 24-year-old Real Sociedad winger – who played a pivotal role in Spain's run to the semi-finals at Euro 2020 – has put La Roja top of Group C heading into Wednesday's encounter with Argentina, who beat Egypt.

Spain, who drew with Egypt in their opener, won gold in 1992 and silver in 2000, but had only qualified once since then, but they failed to score across their three appearances in the 2012 London Games.

CHAMPIONS HELD AS GERMANY BOUNCE BACK

Brazil sparkled in their 4-2 win over Germany on matchday one, though they could not find a way past the Ivory Coast, who held them to a 0-0 draw in Group D.

Douglas Luiz was sent off early on for Brazil, who missed a last-gasp chance to seal qualification through substitute Malcom after the Ivory Coast had also been reduced to 10 men.

Meanwhile, Germany recovered from their defeat on matchday one to beat Saudi Arabia 3-2 – Felix Uduokhai netting the decisive goal in the 75th minute.

Stefanos Tsitsipas is taking inspiration from the grandfather he has never met after battling through to round two of the men's singles at Tokyo 2020.

Alexander Zverev had an altogether more comfortable progression at Ariake Tennis Park, while home favourite Kei Nishikori earned an impressive upset win.

Felix Auger-Aliassime was unable to make the most of two-time defending champion Andy Murray's withdrawal, but it was a good day for Hubert Hurkacz. 

Here's the pick of the action from day two of the men's singles.

TSITSIPAS OUT TO EMULATE GRANDFATHER

Greek ace Tsitsipas, a French Open finalist this year, had to dig deep for a three-set win over Philipp Kohlschreiber.

Should he manage to win gold in the Japanese capital he would be matching the feat of his grandfather, who won the football competition representing the Soviet Union in 1956.

"I've never had the opportunity to meet him. But my mom told me stories of his career and how he got it," he said. "He kind of inspires me in a way. I know what kind of athlete he was, with all the achievements and all the trophies. I'm proud of him. 

"It's something good, a legacy that is being carried on in the family. I'm happy to be the next in the family to be competing at the Olympics."

ZVEREV LOVING OLYMPICS EXPERIENCE

Fourth seed Zverev coasted past Lu Yen-hsun 6-1 6-3 and spoke of how much he is enjoying being around other German athletes.

"Normally you don't have those guys around that much, you have your friends, of course you have people that are around you, but you don't sleep in the same room as them," he said.

"Yes it is very different but in a way very enjoyable. The Olympics are once every four years, and it’s five years now, so I think everybody is enjoying it and everyone is having the best time that they can."

Nishikori is playing at a fourth Olympics and upset fifth seed Andrey Rublev 6-3 6-4. For the 31-year-old the motivation is simple.

"It's [playing in Japan] something I always dreamed of when I was little," he said. 

"Especially now, with the Covid situation, if I can win as many as I can, I think it will bring better news, that's something I'm trying to do this week."

AUGER-ALIASSIME FAILS TO MAKE MOST OF MURRAY ABSENCE

Auger-Aliassime was scheduled to face Murray before the Team GB star pulled out with a quad issue and will instead focus on doubles.

The Canadian was felled by Murray's replacement Max Purcell, though, the Australian winning 6-4 7-6 (7-2).

Fellow seed Gael Monfils also crashed out but Hurkacz was a 6-2 6-4 victor over Luke Saville, while Diego Schwartzman also made it through.

Ash Barty says she will keep fighting for an Olympic gold medal despite her shock opening-round defeat by Sara Sorribes Tormo in Tokyo.

The world number one fell at the first hurdle at Arianke Tennis Park, going down 6-4 6-3 against her Spanish opponent.

There were no such problems for Naomi Osaka; the home favourite overcame China's Zheng Saisai in straight sets.

BARTY TO KEEP FIGHTING FOR GOLD MEDAL

Crowned Wimbledon champion this month, Barty was unable to build on that momentum; amassing a whopping 55 errors.

World number 48 Sorribes Tormo took full advantage to set up a second-round showdown with France's Fiona Ferro.

Anna Kiesenhofer produced a stunning ride to win gold in the women's cycling road race, with the result certainly taking second-placed Annemiek van Vleuten by surprise.

Kiesenhofer was part of a five-strong breakaway group that immediately moved clear before slowly dropping each of her rivals during the 137-kilometre route that concluded at the Fuji International Speedway track.

The Austrian was all alone at the head of the field with around 40km to go and, with other nations unable to organise a pursuit with team radios not in use, she ended up finishing 75 seconds clear.

"It feels incredible. I couldn't believe it," Kiesenhofer said after claiming the biggest victory of her career to date.

"Even when I crossed the line, it was like, 'Is it done now? Do I have to continue riding?' Incredible."

Such was the huge gap, Van Vleuten initially thought she was victorious when crossing the line, only to be quickly informed that was not actually the case.

"Yes, I thought I had won. I'm gutted about this, of course," she confirmed to the media afterwards.

"At first I felt really stupid, but then the others (her team-mates) also did not know who had won."

Still, Van Vleuten can celebrate securing an Olympic medal five years on from the horrific crash when leading the race at the Rio Games.

At the head of the field with 10km remaining, she came off her bike during the final descent, suffering severe concussion and small fractures to her back.

Elisa Longo Borghini claimed the final place on the podium this time around, securing a bronze medal in the road race for a second successive Olympics.

The Italian finished ahead of Lotte Kopecky of Belgium and Marianne Vos, the Dutch rider who triumphed at London 2012.

Jon Rahm has been ruled out of competing at the Tokyo Olympics after testing positive for COVID-19.

The Spanish Olympic Committee announced the world number one had returned a positive result on his third PCR test after competing at The Open at Royal St George's, having previously recorded two negative outcomes ahead of his appearance at the Games.

American Bryson DeChambeau was also ruled out of competing for the same reason on Sunday, having not yet travelled to play in Japan.

For Rahm, it is the second time he has tested positive in as many months. He had to withdraw from the Memorial Tournament on the PGA Tour when leading by six shots after 54 holes.

The 26-year-old won the U.S. Open upon his return to action, securing the first major of his career by one shot thanks to a birdie-birdie finish on a dramatic Sunday at Torrey Pines.

With a shortage of time and considering the health protocols in place for the Olympics, a replacement will not be selected. Spain still has one competitor left in the field in Adri Arnaus, the world number 166.

As for DeChambeau, he admitted to being "deeply disappointed" at missing out on Tokyo.

"Representing my country means the world to me and it is was a tremendous honour to make this team," he said in a statement released by the PGA Tour.

"I wish Team USA the best of luck next week in Tokyo. I will now focus on getting healthy, and I look forward to returning to competition once I am cleared to do so."

Patrick Reed will replace him, provided he clears coronavirus tests scheduled on Sunday and Monday before departing for Japan.

Naomi Osaka is feeling "a little bit refreshed and happy again" after returning to tennis with a convincing 6-1 6-4 triumph over Zheng Saisai in her Tokyo 2020 opener.

The four-time grand slam winner has not featured since the first round of the French Open two months ago where she abandoned her campaign following a warning she risked expulsion over her refusal to take part in news conferences during the tournament.

Osaka, who is the reigning US and Australian Open champion, then decided to skip Wimbledon after opening up on her battles with anxiety and depression.

The 23-year-old was granted the honour of lighting the flame for Tokyo 2020 on Friday and two days later made a successful return at the Ariake Tennis Park, where she represents one of Japan's greatest medal hopes for the Games.

"I feel like, more than anything, I'm just focused on playing tennis. This, playing the Olympics, has been a dream of mine since I was a kid, so I feel like the break I took was very needed," she said.

"But I feel definitely a little bit refreshed and happy again.

"I felt really nervous being in Japan and playing here for the first time in maybe two years, and for it to be my first Olympics. 

"It was definitely really nerve-wracking. But I am glad I was able to win, she is a very tough opponent.

"It's been a while since I played but I feel, more than anything, just happy to be out here. We are playing in a pandemic, and it is really tough for everyone."

Asked how she felt to be talking to the press again, she said: "For me, honestly I don't feel that weird about it.

"It might feel weird to you guys, but I don't know. I'm happy that I guess you guys are asking me questions but more than anything I was just focused on playing tennis and I guess I feel a little bit out of my body right now."

Osaka then revealed that her starring role in Friday's opening ceremony came about in March.

"I was super honoured," she said. That’s a position you dream about and not anyone can do it so when they asked me if I wanted to I was very surprised but very honoured and I'm just happy to be here and happy to play, especially in Tokyo."

The playing conditions have been a quite literal hot topic over the first two days, with the sweltering heats causing issues for players.

Daniil Medvedev and Novak Djokovic were among those to speak out about the decision not to play matches later in the day Tokyo, where temperatures have regularly been above 30 degrees.

Osaka, though, has no such issues, adding: "It feels fine for me. I have played a couple of tournaments here, of course they resurfaced it since I was last here, but I love being here, and I actually really like the weather."

Tunisian teenager Ahmed Hafnaoui admits he surprised even himself with his men's 400m freestyle gold medal victory at the 2020 Tokyo Olympics on Sunday.

Hafnaoui, who turned 18 in December, stormed home from lane eight to win the gold in a major shock, ahead of Australia's Jack McLoughlin and USA's Kieran Smith.

The 18-year-old's time of 3:43:36 beat his personal best by almost three seconds, while bettering his prelims time by two seconds.

"Of course I was surprised with myself. It's unbelievable," Hafnaoui said at the news conference.

"I believe when I touched the wall and I saw myself first. I was so surprised."

Hafnaoui was only the second Tunisian to ever make an Olympic swimming final and claimed his country's second medal in the pool.

"I was in tears, I was in tears in my eyes because when I see the flag of my country and I hear the anthem in the background, it was great," he said. "I’m so proud of it."

Australian quartet Bronte Campbell, Meg Harris, Emma McKeon and Cate Campbell broke the world record as they won gold in the women's 4x100m freestyle relay.

Anchored by Cate Campbell, the Aussies won in 3:29:69 ahead of Canada and the USA. It was Australia's first goal medal of the Tokyo Games.

The USA's Chase Kalisz won the men's 400m individual medley, while Japan's Yui Ohashi triumphed in the women's equivalent.

Top seed Barty bundled out, Osaka cruises

Spain's Sara Sorribes Tormo stunned 2021 Wimbledon champion Ashleigh Barty in straight sets in the first round of the women's tennis singles.

Sorribes Tormo won 6-4 6-3 over the Australian, the world number one missing out on a first Olympic medal having looked well below her best.

The Spaniard controlled the baseline, while Barty only managed to land 42 per cent of her first serves.

Second seed Naomi Osaka cruised past Zheng Saisai 6-1 6-4 in her Olympic debut, returning to the court in style following a hiatus after her French Open withdrawal.

Third seed Aryna Sabalenka had no trouble dispatching Poland's Magda Linette 6-2 6-1.

Men's fourth seed Alexander Zverev eased past Lu Yen-hsun 6-1 6-3.

First-ever skateboarding gold

Skateboarding made its Olympic debut on Sunday, with local Yuto Horigome crowned the sport's first gold medallist in the men's street event.

World number two Horigome qualified in the semi-finals in sixth after scores totalling 33.75 but dominated the final with 37.18.

The Japanese finished ahead of Brazil's Kelvin Hoeffler with 36.15 and Jagger Eaton on 35.35.

Horigome landed three huge tricks in a row in the final, while American favourite Nyjah Huston stumbled down to seventh after four straight falls.

Olympic record in shooting final

Vitalina Batsarashkina won gold in the women's 10 metre air pistol shooting ahead of Bulgaria's Antoaenta Kostadinova and China's Jiang Ranxin.

The Russian tallied an Olympic record 240.3 points, finishing marginally ahead of Kostadinova on 239.4.

"I did not set a goal to win or to get into the top three or even into the final," she said. "I just set the goal to shoot like I can, to show everything that I can."

Chinese gold in diving

China won gold in the women's synchronized 3m springboard diving as Shi Tingmao and Wang Han edged out Canada and Germany.

The Chinese duo scored 76.5 with their last dive to tally 326.4 points and win China's fourth gold medal at the Tokyo Games.

The reigning world champions were well ahead of the pack, with Canadian pair Jennifer Abel and Melissa Citrini-Beaulieu grabbing silver with 300.78. Germany's Lena Hentschel and Tina Punzel claimed the bronze with 284.97.

The gold was Shi's third, having won the individual 3m platform title and this event with Wu Minxia in 2016.

Ash Barty's chances of winning singles gold at Tokyo 2020 came to a juddering halt at the first hurdle as she suffered a shock 6-4 6-3 to Spain's Sara Sorribes Tormo.

The world number one and recently crowned Wimbledon champion was among the favourites for glory in the women's event but put in an uncharacteristically error strewn display at the Ariake Tennis Park.

In total, the amiable Australian racked up a whopping 55 errors in a match that lasted a little over an hour and a half.

Sorribes Tormo had never faced off against Barty before but kept cool amid the stifling Tokyo conditions to progress to a second-round tie with Fiona Ferro of France.

It also marked the first time the 24-year-old had ever beaten a player ranked number one in the world.

Barty's Tokyo adventure is not over just yet, though. On Saturday she and childhood friend Storm Sanders made it through round one of the women's doubles with a 6-1 6-2 beating of Japanese Nao Hibino and Makoto Ninomiya.

Bryson DeChambeau described himself as "desperately disappointed" after a positive test for COVID-19 ruled him out of competing in the golf competition at Tokyo 2020.

A statement from the PGA Tour confirmed the 2020 US Open champion failed the final testing protocol before heading out to the Japanese capital to represent Team USA.

In his place comes Patrick Reed, who is undergoing testing on Sunday and Monday before departing for Japan.

Should he clear that hurdle Reed will become a two-time Olympian having also competed at Rio 2016. He joins Justin Thomas, Open Championship winner Collin Morikawa and Xander Schauffele as part of a star-studded USA line-up in the men's event.

"I am deeply disappointed not to be able to compete in the Olympics for Team USA," said DeChambeau.  

"Representing my country means the world to me and it is was a tremendous honour to make this team.

"I wish Team USA the best of luck next week in Tokyo. I will now focus on getting healthy, and I look forward to returning to competition once I am cleared to do so."

Reed added: "I am so excited to have the opportunity to represent our country and be a part of Team USA in Tokyo.

"I wish Bryson nothing but the best, and I know how disappointed he is to not be able to compete, and I will do my best to play my best and represent our country."

The first Olympic skateboarding champion will be crowned on day two of the Tokyo Games.

Ariake Urban Sports Park will be the venue for the first skateboarding action in Olympic history on Sunday.

Elsewhere, it will be the turn of the women to contest the cycling road race after Richard Carapaz produced a brilliant ride to take gold for Ecuador on Saturday.

Stats Perform picks out of some of the standout action to look out for at the end of the opening weekend of competition.

HUSTON FAVOURITE TO MAKE SKATEBOARDING HISTORY

The men's street will be the first skateboarding event, with four heats followed by a final at 12:25 local time.

Nyjah Huston of the United States is the favourite to top the podium, with 16 street skateboarding medals to his name in the X Games.

Tokyo-born Yuto Origome won gold at the World Street Championships in Rome this year and it would be a great story if he can follow that up with an Olympic triumph on home soil.

Skateboarding great Tony Hawk said on Saturday of the sport's introduction: "I'm surprised it took this long for them to figure it out.

"I believe they needed a youthful energy to the summer Games and it's overdue."

DUTCH DUO UNPRECEDENTED DOUBLE

Anna van der Breggen and Marianne Vos have already won Olympic gold medals and they will go in search of a second in the women's road race.

No female cyclist has won the event twice, but the 2012 champion Vos and defending champion Van der Breggen will start the course at Musashinonomori Park looking to achieve that feat.

EYES ON THE POOL – AND ON THE BEACH

The first swimming medals of the Games will be handed out on Sunday following Saturday's heats.

There is an open field in the men's 400 metre medley final – the first event of the day – after home favourite Daiya Seto failed to qualify.

The women's event does feature Hungary's Katinka Hosszu, though, as she aims to protect her 2016 gold, won with a world-record time that stands to this day.

Meanwhile, Australia will take to the pool confident of another gold in the 4 x 100m freestyle relay final, boasting the title, the world record and by far the best qualifying time.

A new water sport should garner some attention, though, as surfing makes its Olympics bow.

Tsurigasaki Surfing Beach – preferred to a wave pool – plays host for the first and second rounds on Sunday.

Reigning world champions Italo Ferreira and Carissa Moore will hope it is a debut to remember.

USA TO GET ON THE BOARD?

While China are sitting pretty already with four medals, the United States will hope not to have to wait too much longer for their first.

Not since Munich 1972 had they ended the first day of the Games without a medal as was the case on Saturday.

The basketball medals are a long way off being handed out, but plenty of American focus will be on Team USA's opener against France.

Preparations for Kevin Durant and Co have not been ideal and Les Bleus beat USA at the 2019 FIBA Basketball World Cup.

China lead the way with four medals after the opening day of the Olympics, as Richard Carapaz doubled Ecuador's all-time tally of golds in Tokyo.

Yang Qian was the first athlete to strike gold in the Japanese capital, winning the women's 10-metre air rifle competition for China.

Sun Yiwen also claimed a gold medal for China in the women's epee individual fencing event, while compatriot Hou Zhihui came out on top with an Olympic record in the women's 49kg weightlifting.

Pang Wei claimed China's other medal on the opening day, taking bronze in the men's 10m air pistol event.

Carapaz produced a sensational ride to win the men's road race title, becoming the second athlete from Ecuador to win an Olympic gold medal.

Host nation Japan and Italy are joint-second in the medal table with a gold and a silver apiece.

There were three medals for South Korea, including a triumph for Kim Je Deok and An San in the first mixed team archery event.

The United States remain notably absent from the primitive medal table, though, having ended the first day of the Games without a medal for the first time since Munich 1972.