Ash Barty has followed up her shock women's singles defeat by crashing out of the women's doubles after an epic clash with Czech pair Barbora Krejcikova and Katerina Siniakova.

World number one Barty was stunned in the first round of the women's singles on Sunday by Spain's Sara Sorribes Tormo but teamed up with Storm Sanders in the doubles, with the Australian pair reaching the quarter-finals.

However, Krejcikova and Siniakova proved too strong in a three-set thriller, winning 3-6 6-4 10-7.

"You never quite have their measure,” Barty said. "It's disappointing but there's only a couple of points in that match, here and there and it's a different result.

"We did everything right today but just weren't able to win those big points when it mattered most."

Barty's medal hopes are now entirely focused on the mixed doubles, where she has partnered with John Peers.

Andy Murray's bid to become the first male to win four Olympic tennis medals ended with defeat to Croatia's Marin Cilic and Ivan Dogic in the men's doubles.

Murray, teaming up with Joe Salisbury, went down in two hours and 18 minutes after also winning the first set. The Croatian pair won 4-6 7-6 (7-2) 10-7.

The two-time Olympic gold medalist had withdrawn from the men's singles on Sunday due to a right quad injury, preferring to focus on playing doubles. TeamGB have not fielded a mixed doubles team.

TITMUS DOUBLES UP, LEDECKY LIFTS FOR GOLD

Ariarne Titmus backed up her women's 400m freestyle gold medal from Monday with another triumph, getting the better of rival Katie Ledecky to win the 200m free.

The 20-year-old Australian won the final ahead of Hong Kong's Siobhan Bernadette Haughey and Canada's Penny Oleksiak, while Ledecky finished back in fifth.

Ledecky would claim her sixth Olympic gold medal, triumphing in the women's 1500m free, with the US claiming a rare one-two as Erica Sullivan grabbed the silver ahead of Germany's Sarah Kohler.

After being beaten twice by Titmus earlier in the meet, Ledecky said: "I approach each race with a belief in myself. It's the attitude I've always had that's why I've been so successful. Anything can happen, [the attitude I go in with is] I can beat the world record in this race. 

Japan's Yui Ohashi won the women's 200m individual medley, Hungarian favourite Kristof Milak powered to victory in the men's 200m butterfly and Great Britain triumphed in the men's 4x200m freestyle relay.

STEERING ERROR COSTS GB IN ROWING

Australia claimed two gold medals in the rowing at Sea Forest Waterway as Great Britain were left to lament a wayward finish in the men's four final.

Australian quartet Alexander Purnell, Spencer Turrin, Jack Hargreaves and Alexander Hill won in 5:42:76 ahead of Romania and Italy who claimed silver and bronze respectively.

Italy's late charge almost saw a collision with Great Britain, who finished in fourth, after veering towards the neighbouring Italian boat, narrowly avoiding a clash of oars.

GB's Oliver Cook, who steered the men's coxless four, told BBC Sport: "I do (have the steering). I need to diagnose it but I feel I screwed up a bit and as I was closing in at the end and taking big strokes at the end going for the line I forgot the steering and that’s what cost us to be honest, cost us a medal."

Australia also won the women's four narrowly ahead of the Netherlands by 0:34 seconds, with Ireland claiming the bronze more than five seconds back.

Romania secured its first gold medal at the Tokyo Olympics by winning the women's double sculls final, while France triumphed in the men's equivalent.

The Netherlands and China triumphed in the men's and women's quadruple sculls finals respectively.

RADRADRA DREAMING OF FIJI SEVENS GOLD

New Zealand will take on 2016 gold medalists Fiji in the final of the men's rugby sevens on Wednesday evening.

Fiji went through to the gold medal match with a 26-14 triumph over Argentina, who will take on Great Britain for bronze.

New Zealand were too strong for the British, winning 29-7 in their semi-final, with two tries each to captain Scott Curry and Regan Ware.

Former NRL star Semi Radradra, who plays for Fiji after switching codes in 2017 and scored a try against Argentina, said: "Playing in the Olympics is a blessing for me. I never knew I would be here.

"I think it is everyone's highlight to win a gold medal in the Olympics. That is our aim and we try to give back to our people at home."

USA RESTORES CONFIDENCE IN BASKETBALL

Team USA restored some confidence following their first-up loss to France with a comprehensive 120-66 thrashing of Iran in men's basketball.

USA played fast throughout, wasting no time in offense, with Damian Lillard top scoring with 21 points, all from beyond the arc.

Chicago Bulls guard Zach LaVine had eight assists along with his 13 points while Devin Booker, who played in the NBA Finals last week, scored 16 points and had five rebounds and three steals.

USA head coach Gregg Popovich rotated his roster on and off the court, sharing minutes, as hos team piled on 38 points in the last quarter to round out a comprehensive victory.

In Group B, Germany defeated Nigeria 99-92 despite Jordan Nowra's 33-point haul.

Defending double Olympic champion Andy Murray revealed how his daughter provided him with inspiration after his early exit at Wimbledon.

A heavy third-round defeat by Denis Shapovalov had left the Scot questioning whether his hard work in training was worth it after years of injury woe as he tried to regain his spot at tennis' top table.

The two-time Wimbledon winner, who has four young children, now feels prepared and revitalised to compete in his fourth Games off the back of his young daughter's accidental wisdom.

Murray told reporters: "When I got home, the day after my match, my daughter said to me: 'Daddy, you're home because you lost another tennis match?'

"I said: 'Yeah, I did. But what do you do when you lose at something?' And she said: 'You try and try again?' I was like: 'Yeah, that's what I want to do.'

"I want to keep playing because I enjoy it and I still think I can play at a good level. 

"There have been difficult moments obviously in the last few months and the last year with the injuries and stuff, but right now this is the healthiest I've been for the longest period in the last year."

Murray will be part of a six-man squad in Japan, including doubles partner and two-time grand slam doubles winner Joe Salisbury, as he looks to defend his Rio 2016 and London 2012 golds.

As the only player to win back-to-back singles titles in Olympic history, Murray still intends to compete at the top-level of tennis for as long as he is able to do so.

"It can be hard and after tough losses like that at Wimbledon - you question a lot of things," the Team GB athlete added to BBC Sport.

"I do still feel like I am capable of playing high-level tennis and when that isn't the case I will stop playing. But right now I don't believe that is the case."

Yet the Games in Japan provides a completely different challenge in 2021 as all athletes remain acutely aware of the coronavirus concerns that surround sport all over the world.

The 34-year-old's Team GB team-mate Johanna Konta is one of many players to miss out due to circumstances linked to the virus.

Murray, who was drawn against ninth seed and Wimbledon quarter-finalist Felix Auger-Aliassime on Thursday, is familiar with the devastating impact a positive result can have after having to miss a major due to COVID-19.

"It happened to me before the Australian Open and I was gutted," he said.

"Thankfully I was able to compete in another grand slam a few months later, but if you've been preparing for something for five years and something like that to happens to you, it would be brutal.

"So there is an anxiousness, but from what I've seen everyone is taking the protocols seriously, so hopefully there won't be too many issues."

Murray will be hoping for few issues on the court too, though he and Salisbury have been drawn in a difficult tie against second-seeded pair Pierre Hugues-Herbert and Nicolas Mahut.

Andy Murray feels claiming an Olympic medal at Tokyo 2020 would be the greatest achievement of his illustrious tennis career.

Set to take part in his fourth Games as he looks to defend the singles title he won at London 2012 and successfully retained at Rio 2016, Murray knows this tournament is likely to be his last at the Olympics.

A creditable and entertaining run to the third round of Wimbledon came amid questions over his long-term future in the game after several years of injury woe.

After losing to Denis Shapovalov at the All England Club, Murray has been drawn to play against another Canadian, Felix Auger-Aliassime, in Tokyo.

He will also play in the men’s doubles alongside Joe Salisbury, with a tough draw in that competition too against Pierre-Hugues Herbert and Nicolas Mahut.

Despite having three grand slam wins, two Olympic titles and a doubles silver medal to his name, Murray believes a podium place in Japan – which he feels is possible – would be a crowning achievement after all he has been through. 

"That is the goal, to try and win another medal," Murray told reporters. "I'm aware that it is not going to be easy. 

"I'm also in a slightly different position to what I was four, five years ago when I would’ve been expected to get one. 

"Maybe that is not the case this time around, but for me, it would probably be my best achievement if I could do that after everything that’s gone on the last few years. 

"I'm motivated for that reason alone and I still believe that I can do that. I still believe that it is possible."

Now 34, it is by no means certain Murray will still be playing and competitive on the ATP Tour by the time the 2024 Olympics take place in Paris.

"I know that this could be the last [Olympics] for me," added the Briton.

"So I want to go out there and leave everything out on the court, fight for every single point because ultimately that’s all you can do."

Having beaten Roger Federer and Juan Martin del Potro in his two Olympic finals, Murray – who revealed he has practiced well and regularly since Wimbledon - hopes his experience of going all the way at the Games will work in his favour.

He added to BBC Sport: "I've prepared as best as I can. I have tough draws in singles and doubles but I think I have a chance.

"If I can get through a round or two I'll start to feel more comfortable. I also have the experience of playing in the Olympics, which I can use to my advantage."