Third seed Serena Williams advanced to the US Open quarter-finals after a gritty, tension-filled 6-3 6-7(6) 6-3 win over Greece's Maria Sakkari.
Early nerves saw Williams start with a double fault, but the veteran then found her footing, playing strong defensive tennis to save all three break points against her in the first set.
"I just kept fighting," she said. "She was doing so well. She was being so aggressive and I knew I needed to do the same thing."
Meanwhile, second seed Dominic Thiem edged a first-set tiebreak before turning up the heat to romp into the quarter-finals with a resounding 7-6(4) 6-1 6-1 victory over Canadian youngster Felix Augur-Aliassime.
Top seed Novak Djokovic's disqualification on Sunday for striking a line judge with a ball has left Thiem as one of the favourites and the Austrian gave a composed performance to reach the last eight in New York for the second time in his career.
Arsenal's Leandro Trossard capitalised on dreadful defending to secure a 1-0 win against Manchester United that saw the Gunners climb back to the top of the Premier League, ensuring the title race will be decided on the final day.
UAE Team Emirates rider Tadej Pogacar has retained his overall lead after Dutchman Olav Kooij won stage nine of the Giro d'Italia on Sunday, pipping Jonathan Milan by half a wheel right at the finish line in a breathless sprint at the end of a 214-km ride from Avezzano to Naples.
Rory McIIroy claimed his fourth Wells Fargo Championship after a superb back nine saw him finish -17 par having trailed by two shots after seven holes.
Alejandro Tabilo claimed the biggest win of his career beating world number one Novak Djokovic 6-2 6-3 in the third round of the Italian Open, two days after the Serbian was hit on the head by a water bottle.