Novak Djokovic suffered his first defeat since August as Karen Khachanov rose to the occasion in his first Masters final in Paris.
Fifth seed Luksika Kumkhum overcame a slow start to defeat Irina Khromacheva at the Mumbai Open.
Wang Qiang's hopes of winning the WTA Elite Trophy on home soil were emphatically ended by Ashleigh Barty in Zhuhai.
Juan Martin del Potro has failed to recover from a knee injury sufficiently to feature at the ATP Finals, with Kei Nishikori given his spot.
Novak Djokovic will contest his fourth final in a row after beating Roger Federer in a three-hour battle at the Paris Masters.
Julia Goerges' WTA Elite Trophy defence was ended by Ashleigh Barty, who will face Wang Qiang after the Chinese crushed Garbine Muguruza.
Garbine Muguruza will face Wang Qiang in the last four of the WTA Elite Trophy in Zhuhai after Madison Keys pulled out.
Kei Nishikori will wait for injury news after failing to make the ATP Finals, as Dominic Thiem and Marin Cilic qualified instead in Paris.
Novak Djokovic awaits Roger Federer in the last four of the Paris Masters after the Swiss defeated Kei Nishikori.
A raucous Paris crowd saw Novak Djokovic toil against Marin Cilic before clinching victory and a place in the semi-finals.