The 21-year-old Montreal native is still suffering from symptoms from a concussion that happened on September 4.
The Spaniard may have found his confidence once and for all with these three fantastic return winner in Shanghai.
The 25-year-old Czech will make her fifth consecutive appearance at the WTA Finals.
"Nothing is impossible. I have that kind of mindset. I know that it's still a long way to break (Federer's) record," said world No. 1.
Dominic Thiem pulls out this crazy-angled two-hander to clinch a set vs. Yen-Hsun Lu in Shanghai
Kei Nishikori and Nick Kyrgios locked horns for a spirited battle on Wednesday in Shanghai.
Batman or Superman? Clay courts or hard courts? See Tomas Berdych reveal his favorites.
