Sock Overcomes Cilic to Record First ATP World Tour Finals Win

Sock Overcomes Cilic to Record First ATP World Tour Finals Win

"It was probably one of the most annoying noises I've ever heard in my entire life", Sock said.

Roger Federer booked his spot in the semi-finals of the ATP World Tour Finals after a hard-fought win over Alexander Zverev, which saw the Swiss cut a frustrated figure throughout.

"It's been a tough group so to be through in two matches is great".

Sock, who seized qualification by winning the final Masters event of the season in Paris, lost his debut match to Federer, but he is now 1-1.

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.

"It is frustrating, absolutely, at the beginning of the third set I played well", Cilic said.

He hit a powerful forehand victor to let his intentions known early on and set up three break points in the opening game.

Sock twice served well under pressure to stay in the match and despite falling a mini-break behind in the tiebreak recovered to win five unanswered points to claim victory.

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The tension returned in the final game of the set, with Zverev facing multiple break points amid distractions from the crowd and celebrating a point he'd thought he'd won only to be overruled by Hawk Eye, but he got the hold nonetheless to force a breaker in the first.

Jack Sock was quizzed thoroughly at the ATP Finals in London on all things British.

"It was a good battle and I always enjoy myself at this lovely arena", said Federer, who has now reached the semi-finals 14 times.

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). "It's been an interesting morning, a fire alarm went off at 4am and we all had to exit our hotel so it was a long morning".

"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".

The top two players from each group qualify for the semi-finals and after top seed Rafa Nadal pulled out through injury Federer is now a massive odds-on favourite to win the tournament. It's an fantastic atmosphere here and I love playing in London and in front of the fans here.

Novak Djokovic, Andy Murray and Stan Wawrinka are all long-term absentees from the Tour this season.