Richarlison fired a first-half hat-trick before nervy Brazil almost squandered a 3-0 lead against Germany in their Tokyo 2020 opener, while Australia stunned Argentina.
Reigning Olympic champions Brazil eventually toppled Germany 4-2 in the Group D opener in Yokohama, a rematch of the final from the 2016 Games in Rio that went to a penalty shoot-out.
Brazil were pegged back to 3-2 on this occasion before Paulinho's stoppage-time strike ended 10-man Germany's hopes of snatching a draw.
Richarlison made a seventh-minute breakthrough when Germany defender Amos Pieper slipped to allow the Everton striker a clear run on goal. Although his first shot was pushed out by Florian Mueller, Richarlison lashed in the rebound on the half-volley.
A close-range header after 22 minutes made it 2-0 and Richarlison sealed his treble with a shot into the right corner that took a slight deflection off Pieper.
Matheus Cunha missed a penalty for Brazil in first-half stoppage time before clumsy goalkeeping from Santos allowed Germany to get on the scoresheet after the break, Nadiem Amiri's tame volley creeping in.
Germany's Maximilian Arnold was dismissed after a soft second booking for a clash with Dani Alves, but another goal arrived when Ragnar Ache headed home in the 83rd minute, only for Paulinho's clinical breakaway finish, high into the top right corner, to make sure of the points.
Australia enjoyed a banner day as goals from Lachlan Wales and Marco Tilio floored a youthful Argentina side, who had midfielder Francisco Ortega sent off shortly before half-time.
Wales tucked in a low cross from Joel King to give the Olyroos a 14th-minute lead, and Ortega was dismissed for two bookable offences in quick succession to leave Argentina in trouble.
Tilio sealed a 2-0 win with a thumping left-footed strike into the right corner from 20 yards after 80 minutes as Argentina were caught on the break.
France were beaten 4-1 by Mexico, with substitutes Uriel Antuna and Eduardo Aguirre putting the finishing touches to the impressive win with late goals. Andre-Pierre Gignac, who plays his club football in Liga MX, got France's consolation with a second-half penalty.
Burnley striker Chris Wood scored as New Zealand earned a 1-0 win over South Korea, and Milan midfielder Franck Kessie netted in Ivory Coast's 2-1 victory against Saudi Arabia.
Spain were held 0-0 by Egypt, while hosts Japan edged South Africa 1-0 and Romania beat Honduras by the same scoreline.
Djokovic makes dominant start to Olympic gold medal bid
Novak Djokovic began his latest Olympic gold medal bid with a statement victory over Australia's Matthew Ebden at Roland-Garros.
The 24-time major winner took just 53 minutes to wrap up a comprehensive 6-0 6-1 rout on Court Philippe-Chatrier, to set up a potential second-round clash with Rafael Nadal.
Djokovic won bronze on his Olympic debut in 2008, but missed out on a medal after finishing fourth in 2012 and 2020, while he was beaten in round one in Rio by eventual silver medallist Juan Martin del Potro eight years ago.
However, there was no danger of a repeat of the latter this time around. The Serb took just 24 minutes to wrap up a dominant first set, in which he bageled his helpless opponent.
Ebden remained in positive spirits despite his ordeal. At one stage, he offered his racquet to the crowd, who gave him a wonderful reception when he won his first game of the contest at the 11th attempt.
Nevertheless, it only briefly delayed the inevitable, with Djokovic cruising to the finish line.
Data Debrief: Dominant Djokovic soars into second round
There was no messing around from the 24-time major winner on Saturday, as he was done and dusted in just under an hour at Roland-Garros.
He converted six of his nine break-point opportunities, while winning 14 of 19 net points (74%).
The identity of his second-round opponent is still to be decided, but we could well see a blockbuster clash with Nadal.
Jamaica's Ashley McKenzie eliminated in Round of 16 in men’s 60kg Judo
Jamaican Judoka Ashley McKenzie has been eliminated from the men’s 60kg Judo competition at the Paris Olympics at the Round of 16 stage after suffering a 1-0 loss to Turkey’s Salih Yildiz.
Yildiz secured a 1-0 victory over the Great Britain-born Jamaican by throwing a kata-guruma, one of the traditional forty throws of Judo.
McKenzie made history earlier on Saturday with his 10-0 win over Yemen’s Hesham Makabr in preliminary rounds, his first Olympic win competing for the land of wood and water.
Postecoglou hails 'fantastic' youngster Moore after late Vissel Kobe winner
Ange Postecoglou saluted "fantastic" Mikey Moore, after the teenager struck a late winner in Tottenham's J-League World Challenge clash with Vissel Kobe.
The 16-year-old was the hero with his 88th-minute strike sealing a 3-2 victory at the Japan National Stadium in what was Spurs' first match in their preseason tour of the Far East.
Academy graduate Moore became Tottenham's youngest Premier League player when, aged 16 years and 277 days, he made his senior debut against Manchester City in the penultimate game of last season.
And Postecoglou insists the England youth international, who has scored 10 goals in 12 appearances at under-17 level, is deserving of his first-team opportunities.
"Mikey has been fantastic since we brought him in," he told reporters during his post-match press conference. "He's earned his spot on the roster at the moment; he did at the end of last year.
"He got a run with the first team because we could see in training that he was handling himself really well, and that's followed through into pre-season training.
"He's been good in all the games; he probably should have had three tonight, but he did take his goal well by being in the right areas.
"All we can do is keep allowing him to develop. We have to remember that, last year, he had some injuries, and he is only 16.
"I think the future with a lot of our young guys looks pretty promising, but it's our responsibility to make sure they realise their potential and continue to work hard at their game."
Spurs made it three wins from three during preseason, following their 5-1 and 2-0 victories over Hearts and Queens Park Rangers respectively.
"I thought it was a good game," Postecoglou added. "The conditions did make it difficult for both teams, and we've had a hard week of training.
"Credit to the boys. I thought we played some decent football, and they put in as much effort as they humanly could out there.
"You want to provide some sort of entertainment for the supporters who made a great turnout tonight, not just Spurs supporters, but football supporters in general. It's always nice to give back in that way and, overall, I was pleased."
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