Naomi Osaka blew past Coco Gauff to reach the quarter-finals of the US Open on Monday in a lopsided battle of former champions.

Jannik Sinner kept his US Open title defence on track with a battling four-set win over Denis Shapovalov on Saturday as home favourite Coco Gauff sailed into the women's last 16.

Seven-time Olympic gold medallist Biles was among the crowd at the Arthur Ashe Stadium as third seed Gauff suffered an error-strewn public unravelling that left her sobbing into her towel at one point in a calamitous first set.

Gauff, the reigning French Open champion, had prepared for the US Open by shaking up her coaching team on the eve of the tournament in an effort to fix her shaky service game, replacing coach Matt Daly with Gavin MacMillan, a biomechanics specialist.

Coco Gauff says she didn't hesitate to shake up her team just days before the US Open, hoping a new specialist coach can help shore up the serve that has been letting her down.

Gauff is the first American player to lift the trophy since Serena Williams in 2015.

The second-ranked American dug deep to claim a 6-7 (5/7), 6-2, 6-4 victory and her second major title after also defeating Sabalenka at the 2023 US Open.

World number one Aryna Sabalenka battled past four-times champion Iga Swiatek to reach her first French Open final on Thursday with a 7-6(1) 4-6 6-0 victory that ended the Pole's reign in Paris and snapped her 26-game winning streak in the tournament.

The 21-year-old was the runner-up to Iga Swiatek in a one-sided showpiece match in 2022.

Reigning Madrid Open champion Iga Swiatek suffered a crushing semi-final defeat by Coco Gauff on Thursday, with the American triumphing 6-1, 6-1.

Coco Gauff said she was "disappointed but not completely crushed" after her scintillating start to the year came to an abrupt halt in the quarter-finals of the Australian Open on Tuesday.

Badosa reached a Slam semi-final for the first time in her career -- the first Spanish woman to do so since Garbine Muguruza at Melbourne in 2020.

Coco Gauff wrote "RIP TikTok USA" and drew a broken heart on a camera lens shortly after reaching the Australian Open quarter-finals on Sunday after the popular app used by 170 million Americans stopped working in the United States.

The 20-year-old's exit means Serena Williams remains the last woman to successfully defend the US Open title back in 2014.

Coco Gauff survived late-match drama to keep her US Open title defence alive with a 3-6, 6-3, 6-3 victory over Elina Svitolina on Friday.

Gauff, seeded third, fired 10 aces and needed just 66 minutes to beat 66th-ranked Gracheva. She saved eight break points -- including two with aces in the final game

Gauff was not the only big name going out, as Rybakina crashed to a 3-6 7-6(3) 6-4 defeat by former US Open runner-up Leylah Fernandez.

Tearful Coco Gauff was dumped out of the Olympics Games tennis tournament on Tuesday in a stormy defeat to impressive Donna Vekic of Croatia.

The world number one is just one match away from becoming the first woman to win the tournament in three straight years since Justine Henin in 2007 after a 6-2, 6-4 victory.

World number three Coco Gauff came back from a set down to defeat Ons Jabeur and reach her second French Open semi-final on Tuesday.