Jack Sock wins at ATP World Tour Finals despite 4am fire alarm

Marin Cilic's match with Jack Sock was delayed

Who will win the World Tour Finals this year?

But how good are they at deciphering cockney rhyming slang?

Rafael Nadal's dramatic withdrawal from the ATP Finals in London leaves Roger Federer as the only megastar standing at a tournament now looking seriously short of star power.

While this has been an event shorn of some of the biggest names the quality of the matches has, so far, been better than in many recent years, and last night was no disappointment either.

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.

Federer, in his 66th ATP World Tour Finals match, could hardly blame nerves whereas Zverev, in just his second, might have been afforded that excuse for his double-fault at the beginning of his first service game.

Sock claimed five points in a row to set up two match points and he converted the first when a Cilic backhand floated long.

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.

Andy Roddick in 2007 was the previous American to win a match in the ATP Finals.

The Swiss re-found his focus and some consistency on serve in the decider as Zverev's level dipped, earning three breaks to close it out 6-1. This is Federer's city and Roger's house.

"Definitely disappointing in both matches in that third set, being in a good position, putting myself in a good position", he said.

The Croatian fell to Zverev on Sunday after leading by a break in the third set.

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. But there were three of them on this occasion and Federer could only save two of them.

Again, however, Sock came back, converting the second of two break points to pull even at 3-3.



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