There is one Masters 1000 indoors: Paris.
Sock blasted a ball into the crowd in frustration, but channeled his anger to break in the first game of the second set and was clearly enjoying himself, moving around the court nimbly as he levelled the match in dominant fashion.
Cilic looked set to come out on top when he claimed the first mini-break of the tie-break, but Sock showed incredible athleticism to dart in and guide away a victor after a Cilic shot struck the net cord and he won five points in a row to seal a hard-fought victory.
Cilic, playing in his third ATP Finals, made the first breakthrough in the decider to help the Croatian move to a 3-0 lead but Sock recovered his composure to claim three games on the bounce, including a fourth break of Cilic's serve.
While he declared his own recovery had gone to plan after his opening win against Jack Sock, the Swiss sent his best wishes to the world No. 1.
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"That was a tough one for sure", said the American.
Jack Sock has revealed that he was forced out of his room at 4am on Tuesday morning due to a fire alarm at his hotel.
"I love playing in front of the fans here - they make it feel like home".
"Definitely disappointing in both matches in that third set, being in a good position, putting myself in a good position". "I'm living my dream right now and I wanna keep on going".
"He hit a few netcords today, but that's tennis".
Bank of England reveals last day to use old £10 notes
Old notes can still be spent ahead of this date and you can exchange them at the Bank once this point has passed. Now the new plastic £10 note has been jettisoned into circulation the old tenner is to be withdrawn.
'I played during the day time on Sunday so plenty of time there as well.
"My coach nicknamed me showtime when I was young".
The ATP Finals feature the top eight fit male singles players and doubles teams who have accrued the most points throughout the 2017 season.
"But unfortunately I didn't close it", Cilic said. Who will win the World Tour Finals this year?
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