Jack Sock wins in ATP Finals despite rude awakening
Nov 15 2017 by Marjorie Miles
"I don't think I qualified for the ATP World Tour Finals when I was 20!"
"It's been a tough group so to be through in two matches is great".
The pair got off to winning starts in Group Boris Becker, with Zverev surviving a tense battle against Cilic and Federer enjoying a straight sets win over Jack Sock.
Federer and Zverev had already met in the O2 Arena - when the German's practice session overran and his opponent was forced to bounce on his toes for a few minutes while Juan Carlos Ferrero put his man through the last couple of serves.
"I'n happy and relieved that I can play freely against (Marin) Cilic, instead of it being a nailbiter".
"I wouldn't be out here playing, competing if I didn't think I could give myself a chance to win tournaments, to be here", Sock said.
Federer looked in control when he broke in the opening game of the second set, having claimed the first via a tiebreak.
The American fought back from a set down, and a 3-0 deficit in the decider, to triumph 5-7 6-2 7-6 (4).
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Federer only landed 43 percent of first serves in the second set and it finally cost him in the 12th game, when Zverev capitalised on his third set point to force a decider. But Zverev produced two breaks of his own to level the match.
Zverev has been touted as the leader of a pack of young players hungry to oust the creaking old guard but Federer, who has suffered only four defeats all year, shows no sign of slipping. The Swiss world No 2 beat the German in Halle but Zverev returned the favour at the Montreal Masters.
Jack Sock recorded an enthralling three-set victory over Marin Cilic to enhance his chances of progressing past the round-robin stages of the ATP Finals.
"It's been an interesting morning so far", said the American.
"It was a dream for me to be part of it, where the best players take part and you can slog it out against them, knowing you're only going to get better". It's an incredible atmosphere here and I love playing in London and in front of the fans here.
Cilic has now won only one of his eight matches overall at the season-ending tournament.
With Novak Djokovic and Andy Murray sidelined through injury, Federer is the only genuine star left in London and is the clear favorite to lift his seventh year-end title at the grand old age of 36.