"Reflecting on what I've been through in the a year ago, it's quite a phenomenal achievement", said Djokovic after making the quarter-finals in Paris when Bosnian opponent Damir Dzumhur retired trailing 6-1, 2-1.
"The last few days I start to feel a little bit the abdominal, especially when I was serving", Nadal said.
The 37-year-old Swiss had only made a late decision to compete in Bercy after winning his 99th title in his home town Basel on Sunday but, despite a touch of raggedness, was sharp enough on Thursday to outclass the Italian 6-4 6-3 in his opening match.
The 14-time Grand Slam champion had begun his pursuit of the top spot in encouraging fashion with a 7-5, 6-1 defeat of Joao Sousa on Tuesday, his 19th consecutive win.
The night session will be opened by Federer against Fabio Fognini, then Kei Nishikori will face Kevin Anderson.
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McCarthy also said he put little stock in any apparent internal venom toward Montgomery. "But you also trust your players". I think you can ask a lot of guys around the locker room.
He will play Karen Khachanov after the 22-year-old bested John Isner 6-4 6-7 (9-11) 7-6 (10-8).
Roger Federer, who confirmed he will play at the event for the first time since 2015, received a bye in the second round after Canada's Milos Raonic also pulled out due to a right-elbow injury. "The doctor says that is recommended to not play, because if I continue the abdominal maybe can break and can be a major thing". Rafa obviously is struggling with injuries since the US Open.
The giant American saved four match points before the 22-year-old Khachanov, who had already staved off two himself, finally threaded a backhand victor past the net-rushing Isner to win after almost 2 1/2 hours of massive hitting.
Cilic fired 29 winners to advance to the last eight for the third straight year.
With the season-ending ATP Finals in London starting November 11, he is playing three straight tournaments.
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She converted half of her break points, going six for 12, while she saved nine of the 12 which she encountered during the match. It ended the tournament's five-year run in Singapore with the season-finale moving to Shenzhen.
"I am very close to London, to securing my spot mathematically", Cilic said.
'In the next match against Novak it will be another big challenge.
Cilic, who has beaten Djokovic just twice in 17 meetings, ended reigning ATP Finals champion Dimitrov's season.
Djokovic is to next square off against Croatian Marin Cilic, who defeated Grigor Dimitrov of Bulgaria 7-6 (7-5), 6-4 in the round-of-16.
German fourth seed Alexander Zverev was another to go through as he beat American Frances Tiafoe 6-4, 6-4.
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The two had a costly collision in the Azerbaijan Grand Prix that knocked both cars out of the race. "Everything feels hopeless. Vettel broke off from a television interview to congratulate Hamilton on his fifth title and fourth in the last five years.
Thiem, also in contention for the ATP Finals, next faces defending champion Jack Sock of the United States.
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