Shanghai Masters champion Novak Djokovic was in no mood to give John Isner a chance as he moved into the last eight with a 7-5 6-3 victory.
David Goffin offered stern opposition to Roger Federer, but the 20-time grand slam champion battled to victory at the Shanghai Masters.
Tianjin Open favourite Wang Qiang was no match for Heather Watson as the Briton secured a first win over a top-30 player since 2017.
Teenage American Coco Gauff has became the youngest WTA Tour quarter-finals since 2005 in Linz.
With four Shanghai Masters titles to his name, Novak Djokovic pushed on to the third round with victory over Denis Shapovalov in China.
A fifth Shanghai Masters title is on the agenda for Novak Djokovic, who eased past Denis Shapovalov to reach the last 16.
A potential Shanghai Masters double is on the agenda for Novak Djokovic, who faces playing two matches on Thursday.
Wang Yafan produced an impressive display to beat Tianjin Open defending champion Caroline Garcia in straight sets.
Maria Sakkari's withdrawal gave Coco Gauff another chance at the Linz Open and the lucky loser took full advantage.
Fabio Fognini came out on top against Andy Murray after the pair were embroiled in a heated altercation at the Shanghai Masters.
Coco Gauff awaits Kiki Bertens in the last eight at the Linz Open, but Bertens was given a scare on Thursday.
Stefanos Tsitsipas fought back to dethrone Novak Djokovic and will face Daniil Medvedev in the last four in Shanghai.
Roger Federer was not his usual composed self in Friday's three-set loss to Alexander Zverev, with the Swiss docked a point.
All four semi-finalists in the Tianjin Open are unseeded after Magda Linette, Yulia Putintseva and Dayana Yastremska crashed out.
The Shanghai Masters trophy will have a new name engraved upon it after Novak Djokovic and Roger Federer were dumped out.
A point deduction highlighted Roger Federer's frustration in Friday's loss to Alexander Zverev, who impressed the Swiss maestro.
With his comeback "surprisingly smooth" to this point, Andy Murray has hope he can get back to the top of men's tennis.
Fifteen-year-old Coco Gauff achieved a number of firsts with her win over Kiki Bertens at the Linz Open.
Heather Watson has made her first WTA Tour final since March 2016, where she will meet in-form Rebecca Peterson.
After easing past Matteo Berrettini in the last four, Alexander Zverev will meet Daniil Medvedev in the final of the Shanghai Masters.