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.
Paris get Olympic Games under way with stylish opening ceremony
Paris kicked off the 2024 Olympic Games by making history with the first opening ceremony to be held outside on a rainy night in France.
It is the first time in 100 years that the Games have been held in the French capital, and despite the constant showers, thousands of Olympians from the 205 delegations celebrated as they travelled down the River Seine on boats and barges.
During the nearly four-hour sprawling ceremony, spectators were treated to performances by Lady Gaga, Aya Nakamura and Celine Dion as the city showed off the story of France while commemorating Olympic history.
On a tour of the city, Paris' most well-known landmarks, including the Louvre and Notre Dame Cathedral, were on show as fans packed in around the parade route to get a glimpse of the showcase.
The Olympic flag was delivered to the Eiffel Tower on the back of a mechanical horse travelling down the river, while a masked individual carried the torch across the city.
An incredible light show on the Tower then restarted the torch relay, as Zinedine Zidane reappeared to hand it to two-time gold medallist Rafael Nadal.
The Spaniard, with the help of fellow tennis icon Serena Williams, American sprinter Carl Lewis and Romanian gymnast Nadia Comaneci carried the torch back down the river on its way to the cauldron.
Some of France's best Olympians helped carry it the rest of the way before judoka Teddy Riner and sprinter Marie-Jose Perec lit the flame in the hot air balloon cauldron, which rose high above the Parisian sky, to officially mark the start of the Games.
More than 10,500 athletes will compete across 32 sports at the Games, which will close on August 11.
Dewsbury-Hall: Maresca will surprise people at Chelsea
Kiernan Dewsbury-Hall believes new Chelsea manager Enzo Maresca will "surprise a lot of people" when they watch the Blues this season.
The Italian led Leicester City straight back to the Premier League as Championship winners in his only season in charge and succeeds Mauricio Pochettino at Stamford Bridge.
The Foxes topped the second division table with 98 points, with Dewsbury-Hall a key figure in his squad as he netted 12 goals and provided 14 assists last season – his best tally in a single campaign.
Dewsbury-Hall was also named Leicester's Player and Players' Player of the Year.
The midfielder made the switch to West London earlier this month for £30million and is confident that Maresca will have Chelsea challenging for trophies in no time.
"The manager was a big catalyst in wanting me to come," Dewsbury-Hall told BBC Sport.
"I knew from Leicester, a club that went down and had a lot of problems, how he managed to galvanise that if everyone manages to buy into the system.
"I genuinely think in a short space of time we can be pushing for minimum top four - but more than that.
"He may be unknown for a lot of people, but he is top, top level. He will surprise a lot of people."
Chelsea's pre-season got off to a frustrating start as they were held to a 2-2 draw by League One side Wrexham in Maresca's first game in charge on Wednesday.
Dewsbury-Hall did not play in that match but is training with the squad in the United States and could feature in their next outing against Celtic on Saturday.
The 25-year-old is confident the manager's tactics will come across soon, with the players buying into his style.
"We've only been doing it for two or three weeks, but the combination plays are really quick and tidy," he added.
"That's after two weeks. I remember he said to us at Leicester after six months or a year, there might be teething problems at the start, but it will improve.
"Within the first week at Leicester, I was convinced this was top, top level. I felt a bit stupid; I thought I knew a lot about football, but he was teaching me things on a daily basis that I didn't really know before. He has an aura, he can be strict, or gentle and soft - he has both sides.
"I am getting the same feedback here with the lads. They've bought into it here from minute one which is exciting. With a system and philosophy, you need everyone to buy in because, if they do, you can really achieve something."
“The favourite is Thompson”-Boldon highlights Jamaican champion as man to beat in 100m in Paris
Trinidadian four-time Olympic medallist Ato Boldon has named Jamaican sprinting sensation Kishane Thompson as his favourite to take 100m gold at the Olympic Games in Paris.
Thompson, 23, is currently the world leader in the event after running a personal best 9.77 to win the 100m title at the JAAA/Puma National Senior Championships at the National Stadium in Kingston in June.
The MVP Track Club-trained sprinter also produced times of 9.82 and 9.84 in the heats and semi-finals, respectively, at those national championships and, most recently, ran 9.91 shutting down to win at the Gyulai Istvan Memorial in Hungary on July 9.
“Thompson is the favourite,” Boldon said in an interview with LetsRundotcom on YouTube on Friday.
“I know Noah (Lyles) is the World champion. I think Noah made it a little bit more interesting by running that 9.81 into a headwind which kind of almost converts to a 9.77 but there’s no way you can look at the way in which Thompson ran that 9.77 and just go ‘Oh Noah will beat him.’ Noah has his hands full with that guy,” Boldon said.
Blazing speed acknowledged, one thing that Thompson lacks that his other competitors don’t is experience competing at the highest level of the sport with this being his first time representing Jamaica at any level.
If there is anything to prevent Thompson from delivering on the form that he’s shown so far this season, Boldon believes that would be this lack of experience on a stage like the Olympic Games compared to his peers.
“There are things which I see people completely ignoring. Kishane Thompson has not been under the microscope of Olympic favourite. Rounds are a great equalizer. Noah has the medals that he does because of how well he runs rounds. Is Noah suddenly a lock for the silver? No but he does have his hands full,” he said.
“There are others who are going to be in the 100m that are used to the pressure and pressure is a big thing. If he’s able to pull this off, you write books about stuff like that,” he added.
Thompson's quest for Olympic glory will begin in the heats of the men's 100m beginning on Saturday' August 3.
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