Meanwhile, the triathlon, set to be a centrepiece of the Olympics, was postponed due to excessive pollution levels in Paris' river Seine.
Here's what you need to know about the Olympics on Tuesday:
BILES TRIUMPHS
American Biles clinched gold in the team final as she made a triumphant return to the Olympic stage three years after withdrawing from the same event in Tokyo.
Biles, the most decorated gymnast of all-time, earned the United States their fourth Olympic gold in the women's team event with dazzling performances on all four apparatus
IRISH DELIGHT
Daniel Wiffen wiped away tears on the Paris podium after becoming the first Irishman to win Olympic swimming gold, and a medal of any colour, with a thrilling 800 metres freestyle victory on Tuesday.
With his twin brother shouting in the crowd, the 23-year-old world champion touched out in an Olympic record time of seven minutes 38.19 seconds to secure Ireland's first gold of the Games.
Elsewhere in the pool Britain retained their men's 4x200 freestyle relay gold medal, fending off a dogged challenge by the United States at La Defense Arena.
GAUFF HEARTBREAK, NADALCARAZ POWER ON
Women's second seed Coco Gauff's challenge wilted as she was knocked out in the third round 7-6(7) 6-2.
Gauff was left in tears at a crucial moment of the second set when an over-ruled line call saw her slip 4-2 behind, the American becoming embroiled in a lengthy row with the umpire and tournament supervisor.
Rafa Nadal and Carlos Alcaraz combined their formidable firepower to down Dutchmen Tallon Griekspoor and Wesley Koolhof and reach the quarter-finals of the men's tennis doubles.
KIWIS REIGN ON
Defending champions New Zealand underlined their status as a women's rugby powerhouse when they won Olympic sevens gold, but they were pushed all the way in their 19-12 win by a Canada team who had stunned Australia in the semi-finals.
SHARP SHOOTERS
Britain's Nathan Hales clinched the men's trap gold at the Paris Games with an Olympic record, while Serbia's pistol shooters Zorana Arunovic and Damir Mikec stood atop the podium in the 10-metre air pistol mixed team contest.
COVID STRIKES BACK
Tokyo these Games are not. But several athletes have tested positive, including Australian swimmer Lani Pallister, a medal hope in the women's 1,500 metres freestyle who had to withdraw from the event.
SWIMMING IN THE SEINE?
Pollution levels in the Seine remained too high for the men's triathlon to take place on Tuesday, World Triathlon said in a statement, leaving athletes facing more uncertainty.
The race is now scheduled for Wednesday, after the women's event. Should levels of bacteria remain too high, the men's and women's races are likely to be postponed to Friday.
SIZZLING OLYMPICS
And we're not just talking about the fight for medals. State forecaster Meteo France announced a high of 37 degrees Celsius (98.6°F) in Paris, triggering heat protocols in some events.
Soccer players were allowed water breaks, tennis players could use additional breaks to take a shower, BMX riders sat under umbrellas in between runs, and horses were monitored with thermal cameras.
SILVER TRIBUTE
Olympic debutant Stephane Landois won eventing silver on a grey gelding that once belonged to a close friend who died five years ago in a tragic riding accident.
FAMILY AFFAIR
It is not often that siblings qualify for Olympic badminton together -- and even less common that two pairs of siblings meet in a women's doubles match. But that is what happened in badminton on Tuesday as Bulgarian sisters Stefani and Gabriela Stoeva overcame twins Annie and Kerry Xu of the United States.
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