Serena Williams is into the quarter-finals of the US Open after a three-set win over Maria Sakkari ©Getty Images

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The Greek Sakkari had defeated Williams at the Cincinnati Masters last month ©Getty Images
The Greek Sakkari had defeated Williams at the Cincinnati Masters last month ©Getty Images


Williams proved strong on this occasion though, with a Sakkari giving up a weak break in the crucial third set to lose 6-3, 6-7 (6-8), 6-3 ©Getty Images
Williams proved strong on this occasion though, with a Sakkari giving up a weak break in the crucial third set to lose 6-3, 6-7 (6-8), 6-3 ©Getty Images


Williams is attempting to win a record-equalling 24th Grand Slam singles title ©Getty Images
Williams is attempting to win a record-equalling 24th Grand Slam singles title ©Getty Images


Alex de Minaur, 21, is into a Grand Slam quarter-final for the first time after knocking out Canada's Vasek Pospisil 7-6 (8-6), 6-3, 6-2 ©Getty Images
Alex de Minaur, 21, is into a Grand Slam quarter-final for the first time after knocking out Canada's Vasek Pospisil 7-6 (8-6), 6-3, 6-2 ©Getty Images


Pospisil formed new new players' associationthe Professional Tennis Players' Association along with Novak Djokovic on the eve of the tournament ©Getty Images
Pospisil formed new new players' associationthe Professional Tennis Players' Association along with Novak Djokovic on the eve of the tournament ©Getty Images


Bulgaria's Tsvetana Pironkova - playing in her first tournament since Wimbledon 2017 - will meet Williams in the last eight ©Getty Images
Bulgaria's Tsvetana Pironkova - playing in her first tournament since Wimbledon 2017 - will meet Williams in the last eight ©Getty Images


Pironkova dropped her first set of the tournament, but still overcame France's Alize Cornet ©Getty Images
Pironkova dropped her first set of the tournament, but still overcame France's Alize Cornet ©Getty Images
Second seed Dominic Thiem of Austria is the top-ranked player left in the men's singles following Djokovic's disqualification ©Getty Images
Second seed Dominic Thiem of Austria is the top-ranked player left in the men's singles following Djokovic's disqualification ©Getty Images


Three times a Grand Slam runner-up, Thiem was ruthless in beating Canadian 20-year-old Félix Auger-Aliassime 7-6 (7-4), 6-1, 6-1 ©Getty Images
Three times a Grand Slam runner-up, Thiem was ruthless in beating Canadian 20-year-old Félix Auger-Aliassime 7-6 (7-4), 6-1, 6-1 ©Getty Images