Wimbledon champion Roger Federer beat world number one Rafael Nadal 6-4 6-3 in the Shanghai Masters final to capture his sixth title of the year.
Former world number one Maria Sharapova has won her first title since May 2015, beating Aryna Sabalenka 7-5 7-6 (10-8) in the Tianjin Open final.
Juan Martin del Potro came back from two sets down and saved two match points to beat sixth seed Dominic Thiem in a raucous US Open classic.
When Maria Sharapova's first Grand Slam match after a 15-month doping suspension ended with a victory at the U.S. Open, she dropped to her knees and covered her face, tears welling in her eyes.
Canadian teenager Denis Shapovalov upset top-seeded Rafael Nadal 3-6, 6-4, 7-6 (4) in the third round of the Rogers Cup on Thursday night.
Bernard Tomic says he has never "really tried" throughout his tennis career, adding that he has probably been operating at "around 50%".
Romania captain Ilie Nastase has been banned from official roles by the International Tennis Federation (ITF) until 2021 following his tirade at a Fed Cup tie in Bucharest in April.