Canada sensationally ended a 36-game winless run against the United States, with Jessie Fleming's penalty securing a place in the women's football final at the Tokyo Olympics.
USA had 17 attempts on Monday but a second defeat at the Games – they had gone down 3-0 to Sweden in their opening group fixture – means the reigning world champions will not have a chance to secure gold in Japan.
There was controversy surrounding the winning goal, too, as a VAR check resulted in Canada being awarded a penalty for a foul by Tierna Davidson on Deanne Rose in the 74th minute.
Substitute goalkeeper Adrianna Franch, who had replaced the injured Alyssa Naeher in the first half, guessed correctly but Fleming's penalty still found the net.
Canada stubbornly held on for the remainder of the contest to secure a first triumph over their rivals since March 11, 2001.
While USA can still claim a bronze medal, Megan Rapinoe did not hold back when assessing the impact of the result, particularly against opponents they have become accustomed to beating through the years.
"It's a bitter one to swallow. We never want to lose to Canada. I don't think I ever have, so it's a bitter one," Rapinoe said.
"Still a lot to compete for. It's not the colour we wanted, but there's still a medal on the line and that's a huge thing. We want to win that game, but this sucks. It sucks."
Asked why USA had struggled so much to find form during the tournament, Rapinoe replied: "I feel like we haven't had our joy a little bit.
"It just hasn't flowed for us, hasn't been easy. It's not for a lack of effort, or anyone not giving everything they have. It just didn't click for us.
"I don't know if it was roster rotation, I know it's a tough tournament when trying to save people, but our bench is as deep as hell. I don't think we can put it on that, and I can't quite put my finger on it.
"We just didn't have that juice that we normally do."
USA had been aiming to strike Olympic gold for a fifth time having missed out on a medal of any colour at Rio 2016, where they lost to Sweden on penalties in the last eight.
The Swedes lost to Germany in the final five years ago but could still go one better this year – they take on Australia in the second semi-final.
China defended the women's team sprint title on the opening day of track cycling at Tokyo 2020, having earlier broken the world record.
The duo of Bao Shanju and Zhong Tianshi overcame Lea Sophie Friedrich and Emma Hinze of Germany in Monday's final.
Denmark also set a new Olympic benchmark during qualifying for the men's team pursuit. Here is a round-up from day one at the Izu Velodrome.
MORE VELODROME GOLD FOR CHINA
Four years ago, it was China who triumphed in the women's sprint event at Rio 2016, while in London four years previously they were relegated to silver.
They laid down a marker in qualifying with a new world-record time of 31.804 seconds.
Interestingly, the previous benchmark (32.034) was actually slower than the old Olympic record of 31.928 as the UCI never ratified China's Rio 2016 Olympic record as a world best.
In the final, Bao and Zhong were .325 seconds in front by the midway stage but a strong finish from the German pair meant there were 85 thousandths of a second splitting the teams, with China clocking a 31.895.
The Russian Olympic Committee defeated the Netherlands in the bronze medal race.
GERMANY SMASH RECORD AS GREAT DANES SET NEW OLYMPIC MARK
World-record holders Denmark surpassed the old Olympic marker set by Great Britain at Rio 2016 in qualifying fastest in the men's team pursuit.
The rapid Danes clocked a time of 3:45.014 to set up a meeting with GB, whose time of 3:47.507 is the quickest they have posted, for the right to contest the gold medal.
Whoever comes out on top in that battle will face either Italy or New Zealand.
Germany registered the fastest time in the women's team pursuit – indeed, the fastest time in history, almost three seconds quicker than the previous world record – and go up against Italy, with the victors to meet either Great Britain or New Zealand for the gold.
The Belarusian sprinter who refused to board a flight home from Japan after allegedly being taken to the airport against her will is "safe" and being protected at a hotel, the International Olympic Committee (IOC) confirmed.
Krystsina Tsimanouskaya, 24, was in Tokyo to contest the women's 200 metres and 4x400m relay events but was told to pack her things after publicly criticising her team's organisation on social media.
She claimed a Belarusian coach entered her for the relay despite her never racing in the event before, which she suggested was a result of members of the team being considered ineligible due to not completing enough doping tests.
The Belarus National Olympic Committee (NOC) said her withdrawal from competition was due to her "emotional, psychological state", but Tsimanouskaya insisted she was being forced to leave Tokyo "without my consent".
The Belarusian Sport Solidarity Foundation indicated Tsimanouskaya feared for her life upon returning to Minsk. The country is under the authoritarian leadership of president Alexander Lukashenko, whose son Viktor heads the NOC.
Last December, IOC president Thomas Bach banned both men from attending the Games, declaring: "The IOC has come to the conclusion that it appears that the current leadership has not appropriately protected the Belarusian athletes from political discrimination within the NOC, their member federations or the sports movement."
Tsimanouskaya managed to alert police at the airport, and IOC spokesman Mark Adams later said at a news conference: "She assured us and has assured us that she feels safe and secure. She spent the night at an airport hotel in a safe and secure environment.
"The IOC and Tokyo 2020 will continue their conversations with her and the Japanese authorities to determine the next step in the upcoming days."
Tsimanouskaya has already been offered a visa by Poland.
Olympic champion Adam Peaty was left disappointed by some of the reaction to his plans to take an extended break from swimming.
It has been another fruitful Games in Tokyo for Team GB swimmer Peaty, who claimed gold in the 100 metres breaststroke and 4x100m mixed medley, as well as a silver in the men's 4x100m medley.
After taking his overall Olympic medal tally to five, Peaty announced on Sunday that he would be taking a break from the pool to recharge the batteries ahead of a hectic 2022 schedule.
While set to miss the International Swimming League, which starts in September, he will set his sights on the World and European Championships next year, as well as the Commonwealth Games.
Peaty cited the need to protect his mental health, becoming the latest high-profile athlete to do so in recent days after Simone Biles and Ben Stokes.
He said the reaction to his announcement to over 116,000 followers on Twitter showed why there remains "such a stigma around mental health", insisting the pressures of competition make taking time out essential.
"Reading some of the comments in response to this is why we have such a stigma around mental wellbeing in sport," tweeted Peaty, who has now won a combined 31 gold medals in major competitions.
"It isn't a normal job. There is a huge amount of pressure. Money does not buy happiness.
"I'm taking a break because I've been going extremely hard for as long as I can remember. I've averaged two weeks off a year for the last seven years.
"Unfortunately, there are people out there who think they know you more than you know yourself."
Simone Biles is set to make her long-awaited return in the Tokyo Olympics after being named on the starting list for Tuesday's balance beam final.
The United States star withdrew from the other four individual events for which she had qualified after pulling out of the women's team competition after just one rotation.
Biles, who won four gold medals at the Games in Rio de Janeiro in 2016, cited a need to focus on her mental health as she chose not to contest the individual all-round, vault, uneven bars and floor exercise finals.
USA Gymnastics said in a statement on Sunday: "Simone has withdrawn from the event final for floor and will make a decision on beam later this week. Either way, we're all behind you, Simone."
However, the team announced via Twitter on Monday: "We are so excited to confirm that you will see two U.S. athletes in the balance beam final tomorrow - Suni Lee AND Simone Biles!! Can’t wait to watch you both!"
Speaking last week via Instagram, Biles explained her mind and body were "simply not in sync" as she struggled with a mental block over her technique.
"For anyone saying I quit, I didn't quit, my mind and body are simply not in sync as you can see here," Biles wrote on her story. "I don't think you realise how dangerous this is on a hard/competition surface. Nor do I have to explain why I put health first. Physical health is mental health.
"It's honestly petrifying trying to do a skill but not having your mind [and] body in sync.
"Literally cannot tell up from down. It's the craziest feeling ever, not having an inch of control over your body."
Jeff Henderson, who won long jump gold for the USA in Rio, praised Biles for speaking openly about her difficulties.
"Almost every athlete [has these problems]. They just don’t speak on it," Henderson told Stats Perform.
"Every athlete goes through a mental breakdown or [has to] figure out their brain, what to do, over-thinking - that’s every athlete.
"I think it should be awareness for every athlete to have that issue because it's a huge thing to be protective of. If you're not protective of your mental [state], you're not going to do anything physical.
"There's nothing wrong with that. Any athlete would say take your time, relax, get your mental right come back when you're going to be ready. Every athlete would say that."
Long jump favourite Juan Miguel Echevarria was left in despair after injury prevented him from chasing the gold won by Miltiadis Tentoglou on countback at Tokyo 2020 on Monday.
Tentoglou said he was lucky to win gold in a shock result over Echevarria with a last-ditch sixth-round leap of 8.41m, beating Echevarria on countback, while Cuba also claimed bronze thanks to Maykel Masso's jump of 8.21m.
Echevarria, who had topped qualifying, had a final chance to beat the mark with his sixth attempt but could not make the jump due to injury, slumping to the floor on his knees in despair, consoled by compatriot Masso.
"It was very, very painful. I couldn't do what I usually do," Echevarria said.
"I have no words to express how I feel because I couldn't achieve what I wanted, what I have been fighting for so many years.
"I am personally not very happy with the result. I have always tried to go further."
The Greek had earlier registered a second-best jump of 8.15m compared to Echevarria's 8.09m to have the countback advantage, with his final attempt putting him ahead.
"Last attempt, I told myself to calm down and do a normal jump. I didn't expect it could be so big," Tentoglou said.
"I consider myself lucky. I was not lucky to jump 8.41m the last attempt but I was lucky to win."
The winning distance of 8.41m was well short of Mike Powell's world record of 8.95m, which has stood since 1991.
Tentoglou backed Echevarria to move on from his Olympic disappointment and one day reach the milestone.
"If someone can do the world record, it's Juan Miguel," he said. "I don't know for me. I need to do the national record first. I am not the national record holder."
Puerto Rico's Jasmine Camacho-Quinn triumphed in the women's 100m hurdles a day after setting a new Olympic record in the semi-finals.
Camacho-Quinn won in 12.37 ahead of USA's Kendra Harrison (12.52) and Jamaica's Megan Tapper (12.55), who had an anxious wait to find out if she had claimed bronze ahead of Nigeria's Tobi Amusan (12.6) in fourth.
The Puerto Rican admitted afterwards she had her sights set on Harrison's world record of 12.2 but clipped a hurdle to thwart her.
TEAM USA AVOID BASKETBALL SHOCK
The United States bounced back after trailing to France in the last quarter to record a 93-82 win in the women's basketball.
France had headed the US 72-71 in the fourth quarter, but the gold medal favourites rallied with a 7-0 run to assert their dominance.
A'ja Wilson was huge in the final quarter, finishing with a game-high 22 points, along with seven rebounds and three assists, while Breanna Stewart had 17 points, seven rebounds and seven assists.
Japan booked their quarter-final spot with a 102-83 win over Nigeria, while the US will go through in top spot from Group B ahead of the quarter-finals.
HOCKEYROOS HEARTBREAK, INDIAN JOY
Australia's Hockeyroos had a perfect group phase with five wins from as many games but were stunned by India in the quarter-finals 1-0 in women's hockey.
Gurjit Kaur scored the winner from a 22nd-minute penalty corner to stun the Australians, who have not medalled in women's hockey since Sydney 2000.
Australia also lost in the quarter-finals at Rio 2016 but were far better placed in Tokyo after their exceptional group form.
India have never claimed an Olympic medal in women's hockey, finishing fourth in 1980, and will face world number five Argentina in the semi-finals.
Argentina, who have won medals at four of the past five Olympics, overcame Germany 3-0 aided by two goals late in the first half.
INDONESIA WINS FIRST TOKYO GOLD
Indonesia won its first gold medal of Tokyo 2020 as Greysia Polii and Rahayu Apriyani combined to triumph in the women's badminton doubles.
The Indonesian pair defeated China's Chen Qing Chen and Jia Yi Fan 2-0, in a triumph that was the country's first in women's doubles, having won all other badminton events.
Kim So-yeong and Kong Hee-yong won the all-South Korean bronze medal match against Lee So-hee and Shin Seung-chan 2-0.
Five years ago, Inbee Park was not sure she would even be healthy enough to compete at the Rio Olympics.
The LPGA star had battled a thumb injury throughout the year and would end up skipping three of the tour's five majors, but she made representing South Korea a top priority and it paid off.
Park nearly went wire-to-wire to win gold, sitting a stroke back of the lead after one round and moving ahead to stay the following day before winning by five strokes over New Zealand's Lydia Ko.
Looking back on that experience heading into the Tokyo Games, Park said on Monday she feels much more relaxed.
"[In] 2016 I felt the most pressure in my life. I don’t think I could do that once again," Park said.
"It’s definitely much better and much more relaxing this year because my conditions are not as bad as in 2016, where I had to deal with injuries and a lot of pressure."
She knew how many people were counting on her then as golf returned to the Olympic programme for the first time in more than a century, and the opportunity inspired her to push through the pain.
“I was representing the country and going through the injury," she said. "It wasn’t like a normal tournament where if you don’t feel well, you just pull out and play well in the next event.
"I really wanted to play well and didn’t want to withdraw from the tournament because of the injury. I was just trying really hard to fight the injury.
“With the injury, a lot of people got worried. My family, staff, and probably the whole of Korea was worried that I was not in the best condition.
"That was kind of the pressure I was dealing with. To overcome that was really hard.
“I think that kind of pressure gave me the power to overcome a lot of the stuff, and being able to win gold was amazing.”
Park's quest to repeat begins on Wednesday at 8:41 am local time, when she will open Olympic play in a grouping with Ko and 2016 bronze medallist Feng Shanshan of China.
She said she watched last week's men's tournament on television to try and get a feel for the course, then got in some practice Sunday and founded it firmer and longer than she had expected.
However it plays later this week, she expects a difficult test but feels she is in a good position to handle it this time around.
“I’m very excited to be here representing the country twice in a row," she said.
"It’s the biggest honour for me. [To be] here in Tokyo five years after Rio, it’s truly a dream come true for me."
Jamaica’s bold ambitions of chasing a double sprint sweep evaporated in unexpected fashion after 100m bronze medallist Shericka Jackson failed to advance from the heats.
It was, however, the way in which Jackson saw her bid for another individual medal slip away that left onlookers slack-jawed. Competing in heat 5, the athlete, one of the fastest women in the event this year, seemed well in control of the race early on but began to cruise closer to the line.
The Jamaican was passed by Portugal’s Lorène Bazolo and also Italy’s Dalia Kaddari at the finish. Kaddari finished third in 23.26, the same time as Jackson but advanced when the times were rounded down further. With the heat being one of the slower events Jackson was also unable to advance as one of the fastest losers. Jackson’s heat was won by the Bahamas’ Anthonique Strachan.
There was no such trouble for Jackson’s compatriot, defending Olympic champion Elaine Thompson-Herah who advanced from heat 6 after finishing in third position. The heat was won by Canada’s Crystal Emmanuel with Great Britain’s Beth Dobbin second.
100m silver medallist Shelly-Ann Fraser-Pryce also advanced in comfortable fashion after winning heat 2 in 22.22. Namibia’s Beatrice Masilingi was second in 22.63, with the Netherland’s Dafne Schippers also securing qualification with her third-place finish of 23.13.
The women’s semi-finals will take place on Monday at 5:25 am.
Though there is plenty of baseball still to be played before October, the Tampa Bay Rays made a statement over the weekend with their three-game sweep of the Boston Red Sox.
The Rays held on for a 3-2 victory Sunday to increase their lead in the American League (AL) East division to a game and a half after entering the series trailing Boston by the same margin.
Brandon Lowe started the Rays off in the third inning with a two-run homer but former Ray Hunter Renfroe answered for Boston with a solo shot in the fourth.
Manuel Margot singled in what proved to be the winning run in the fifth and Boston could get no closer than the seventh-inning wild pitch by Drew Rasmussen that allowed Alex Verdugo to score.
The Rays had some nervous moments late as the Red Sox put two batters on with two out in the ninth but Randy Wisler got J.D. Martinez to fly out to end the game.
Bryant, Giants down Astros
Kris Bryant hit a home run in his first game since joining San Francisco and Darin Ruf drove in three runs as the Giants defeated Milwaukee Brewers 5-3 to win the series between teams with the two best records in MLB. Bryant joined his former Chicago Cubs team-mates Anthony Rizzo (Yankees) and Javy Baez (Mets) in hitting a homer in their first games with their new teams after being traded this week. According to Stats Perform, they are the first trio in the modern era to homer in their debuts after playing for the same team earlier in the season.
Los Angeles Dodgers star Mookie Betts returned from the injured list to start at second base for only the second time since 2014 before capping the scoring with a ninth-inning home run in a 13-0 rout of the Arizona Diamondbacks.
The Chicago White Sox bounced back from an agonising loss to the Cleveland Indians with a 2-1 victory on Brian Goodwin's ninth-inning home run punctuated by an epic bat flip.
Kyle Gibson got plenty of run support in his Philadelphia Phillies debut after coming over from the Texas Rangers in a trade, picking up the win with 6.2 solid innings in a 15-4 rout of the Pittsburgh Pirates.
The Milwaukee Brewers managed only three hits off Charlie Morton and the Atlanta Braves' bullpen but held on for a 2-1 road victory.
Cubs waste Ortega's big day
A day after Chicago White Sox catcher Seby Zavala hit the first three home runs of his career only to see his team lose, Chicago Cubs outfielder Rafael Ortega hit three in a 6-5 loss to the Washington Nationals. The 30-year-old journeyman, who made his MLB debut in 2012, had six homers in 192 career games entering Sunday. He drove in all of Chicago's runs with a solo homer in the first inning and two-run shots in the sixth and eighth, but it was not enough as Yadiel Hernandez led off the ninth with a homer to give Washington the walk-off win.
Heim the homer hero again
Jonah Heim hit a walk-off home run to beat the Seattle Mariners on Saturday, and he enjoyed it so much he did it again Sunday in a 4-3 Texas Rangers win. Heim became the first Rangers player ever to hit walk-off homers in consecutive games and the first player for any MLB team to do so since Albert Pujols of the St Louis Cardinals did it in June 2011.
Sunday's results
Philadelphia Phillies 15-4 Pittsburgh Pirates
Washington Nationals 6-5 Chicago Cubs
Toronto Blue Jays 5-1 Kansas City Royals
Cincinnati Reds 7-1 New York Mets
New York Yankees 3-1 Miami Marlins
Tampa Bay Rays 3-2 Boston Red Sox
Detroit Tigers 6-2 Baltimore Orioles
Milwaukee Brewers 2-1 Atlanta Braves
Texas Rangers 4-3 Seattle Mariners
Chicago White Sox 2-1 Cleveland Indians
St Louis Cardinals 7-3 Minnesota Twins
Oakland Athletics 8-3 Los Angeles Angels
Los Angeles Dodgers 13-0 Arizona Diamondbacks
San Francisco Giants 5-3 Houston Astros
San Diego Padres 8-1 Colorado Rockies
Indians at Blue Jays
The Toronto Blue Jays (54-48) are riding a four-game winning streak as the Cleveland Indians (51-51) cross the border to visit Rogers Centre.
Lando Norris saw his 15-race points streak end with a first-lap crash at the Hungarian Grand Prix, and he took no solace in an apology from the man who started the chain reaction.
Valtteri Bottas failed to time his braking in Turn One and hit Norris, sending the McLaren driver into Max Verstappen as Bottas continued on to take out the other Red Bull car driven by Sergio Perez.
While Norris was able to remain on the track and reach the pits, his team determined he had suffered too much damage to continue, leaving the Briton frustrated with his early exit.
Bottas also was forced to retire, along with Perez, and the Finn apologised to Norris afterward.
“I had a poor start,” Bottas said. “Wheelspin off the line, and lost places, and then braking into first corner I was right in the gearbox of Lando and I just locked the wheels.
"So probably being that close didn’t calculate quite right the braking point, locked two wheels, hit him, and then it was a mess.”
It was a mess that left the other two drivers knocked out of the race furious. Perez called it a "big mistake" on Bottas' part and feared another engine loss due to the damage incurred.
Norris had no time for Bottas saying he was sorry for the wreck.
“There’s not much to say is there?" Norris said. "It’s not my fault, like, to be honest he [Bottas] just came over to me then and apologised – but apologies are nice, but it doesn’t change the result or anything, so it’s Lap 1 of the race, no one has to do anything stupid but that’s what they did today. So just ruined it.”
With his pursuers Bottas and Perez also knocked out, Norris remained a distant third in the championship standings as leader Verstappen slipped into second behind Lewis Hamilton following a 10th-place finish.
England defender Tyrone Mings has revealed his mental health "plummeted" during Euro 2020 when he was labeled the side's "weakest link".
The 28-year-old Aston Villa man was drafted into the England XI in Harry Maguire's absence for the side's opening two Euro 2020 games against Croatia and Scotland.
Mings revealed he spoke to a psychologist to cope with the pressure in the build-up as his mental health plummeted due to the public's doubts about his ability.
“I did have a tough time in the lead-up to the opening game against Croatia," Mings told The Sun. “I think I’m a lot more hardened to outside influences now, but my mental health did plummet.
"And I have no shame in admitting that because there was so many unknowns about me going to that game.
“I was probably the only name on the teamsheet that people thought, ‘Not sure about him’. And that was something I had to overcome.
“When 90-95 per cent of your country are having doubts over you, it’s very difficult to stop this intruding on your own thoughts.
“So I did a lot of work on that with my psychologist. I was given a lot of coping mechanisms — whether it was breathing, meditation, or just learning how to bring yourself into the present moment. To stop letting your subconscious take over.
“It was hard. I didn’t really sleep very well before that first game.”
England kept clean sheets in both games, before first choice Maguire returned to the England starting line-up after injury at Mings' expense.
Mings, whose comments come in the wake of US Olympian Simone Biles' withdrawal from Tokyo 2020 citing mental health, said comments made by ex-Manchester United defender Rio Ferdinand on BBC about him being the weakest part of the team impacted him.
“Rio DM’d me after the tournament. He’d said I was the weak link, and that Croatia should be targeting me," Mings said.
“He messaged me saying something like, ‘Top-class response — matched your performances on the pitch.’ What a lovely guy.
“It’s just great that we are playing in a time now when you can speak about mental health, and how you are feeling.
“We have seen with Simone Biles you can speak on how you are feeling and hopefully feel supported by many people.”
Chris Paul and Kawhi Leonard are expected to decline player options for next season ahead of the NBA free agency period opening on Monday, but the veteran stars may stay with their teams.
After leading the Phoenix Suns to the NBA Finals, Paul will not exercise his $44million option for the 2021-22 season, The Athletic reported. ESPN added that the Suns are optimistic they will be able to re-sign the 36-year-old.
Yahoo Sports first reported Leonard would decline his $36m option with the Los Angeles Clippers and become an unrestricted free agent, but ESPN reports he is expected to remain with the Clippers on a new deal after suffering a season-ending knee injury during the playoffs.
Even if they end up staying where they are, those two will be the two biggest names on the open market beginning on Monday, but others figure to be available in trades.
Kyle Lowry of the Toronto Raptors may top that list as he is expected to move on from Toronto. ESPN reported that the Miami Heat's move to pick up Goran Dragic's $19.4m team option might have been designed to facilitate a sign-and-trade deal for Lowry.
Ben Simmons also could be on the move from the Philadelphia 76ers, but Bradley Beal now seems set to stay with the Washington Wizards after they sent Russell Westbrook to the Los Angeles Lakers in a draft-night trade.
John Isner has claimed his sixth Atlanta Open title after a straight sets win over American teenager Brandon Nakashima in Sunday's final.
Isner, who had won five of the past seven Atlanta Opens held, triumphed 7-6 (10-8) 7-5 in one hour and 56 minutes.
The victory is world number 35 Isner's 16th ATP Tour career title. It is also 36-year-old Isner's first title since 2018.
Isner sent down 21 aces on route to the win, where his serve was not broken once with Nakashima unable to convert any of his three break points.
The 208cm American broke for the first time in the crucial game, deciding the contest with Nakashima dishing up a double fault on match point.
Nakashima had beaten Isner in last week's Los Cabos Open semi-finals but the veteran has made the Atlanta court his own.
The 19-year-old had one set point in the first set tiebreaker which he failed to convert before Isner capitalized with his third, winning 10-8.
Isner's dominance was on his serve, winning 81 per cent of first serve points, which he landed 58 of 77, with break points rare until the final three games.
The big American had three break points at 5-4 in the second set but Nakashima saved them all, before the teenager let slip two break points in the next game.
Isner converted a single break point in the 12th game of the second set to salute.
Italy enjoyed arguably their greatest night in athletics on Sunday with two gold medals in the men's 100 metres final and the men's high jump at the Tokyo Olympics.
Marcell Jacobs won the first Olympics title in the post-Usain Bolt era, crossing the line in a new European record time of 9.80 seconds ahead of the United States' Fred Kerley and Canada's Andre de Grasse.
The men's 100m, the first at the Games not featuring three-time champion Bolt since 2004, had been difficult to predict and that continued in the semi-finals as USA trials winner Trayvon Bromell, the fastest man in the world this year, failed to qualify with a time of 10.00.
The quickest times were in the third semi-final, won by 60m expert Su Bingtian, who smashed the Asian record with a time of 9.83 to become the first man from the continent to reach the Olympic 100m final since 1932.
After Great Britain's Zharnel Hughes was disqualified for a false start, Su this time could not get the explosive start he needed and it was Jacobs who held his form and speed to cross the line first.
His triumph came barely an hour after a memorable high jump competition concluded with joint gold medallists being declared.
Italian Gianmarco Tamberi and double world champion Mutaz Essa Barshim each enjoyed spotless records before three failures at 2.39, a height that would have matched Charles Austin's Olympic record set in 1996.
Rather than contest gold and silver in a jump-off, the two agreed to share first place, celebrating wildly after speaking with the official.
"It's amazing, fantastic, it's a dream. It's incredible. No words," said Jacobs to the BBC before admitting his compatriot's exploits had inspired him.
"I watched him from the blocks and he boosted me really, really hard. I love Gianmarco. It's fantastic."
Tamberi added: "This night is memorable. We made our dream come true and we passed through many difficult times. I don't know what to say.
"We dreamed it so many times and now we did it."
Rojas leaps into record books
Yulimar Rojas twice jumped clear of the world record to win the women's triple jump title and secure Venezuela's first gold of the games.
The two-time world champion soared well over the mark of 15.50 set by Ukraine's Inessa Kravets in 1995 with her third jump, although she was beyond the board.
However, with her final attempt, Rojas leapt to a sensational 15.67 to finish 56 centimetres ahead of Patricia Mamona in second and Ana Peleteiro in third, each of whom claimed national records.
"I always said I was born with a talent, with a gift and I was destined to do great things in life," she said. "I think I'm opening doors and not just for myself. I'm opening doors [for people] who want to follow me. I'm so happy here to be talking to you, to write the history of my country."
The women's long jump final will be contested on Tuesday, with Serbia's Ivana Spanovic topping the qualifying with a distance of 7.00m.
In the 100m hurdles semi-finals, Jasmine Camacho-Quinn laid down a marker to the rest of the field, romping through in a time of 12.26s to break Sally Person's Olympic record of 12.35s.
In the 3000m steeplechase, favourite Hyvin Kiyeng and reigning world champion Beatrice Chepkoech eased into the final amid punishing earlier temperatures in Tokyo.
Warholm and Benjamin surge into final
One of the great modern rivalries in men's athletics will continue on Tuesday after Karsten Warholm and Rai Benjamin eased into the final of the 400m hurdles.
Warholm, who broke the world record in Oslo a month ago, finished seven hundredths of a second ahead of the American in the first semi-final on Sunday.
Alison dos Santos of Brazil qualified with an arena record of 47.31s, just behind Warholm's 47.30s. A field so stacked with talent it was described by former Olympic champion Felix Sanchez as "insane" will make for a gripping final.
The men's heats in the flat 400m were also completed, world record holder Wayde van Niekerk qualifying in 45.25s, some way down on the leading time of 44.82s set by Michael Cherry.
Ferguson Rotich was the fastest in the men's 800m semi-finals, but Nijel Amos, who claimed silver in 2012 behind the great David Rudisha, collided with Isaiah Jewett and will not contest the final.
Gold for Gong as Adams completes set
China's Gong Lijiao won the women's shot put final with a personal best of 20.58cm.
Raven Saunders was second and double former champion Valerie Adams, who won silver five years ago, took the bronze to complete her medal collection at this event.
"I've seen Valerie winning gold all the time and I'm very happy for her, but this time it is finally my time," said Gong.
Anita Wlodarczyk, who is bidding to become the first woman to win an individual athletics gold at three consecutive Games, needed just one throw to book her place in the hammer final.
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