Jack Sock ends United States drought with ATP Finals win vs. Marin Cilic

Jack Sock ends United States drought with ATP Finals win vs. Marin Cilic

"To keep myself right there like I did in the third set after being down a break, also in the tiebreaker, I can give myself a chance", he said.

Jack Sock became the first American to win a match at the Nitto ATP Finals in 10 years when he outlasted fifth-seeded Marin Cilic on Tuesday in pool play at London.

Sock, the American number one, came from nowhere to reach the end-of-season event, reaching London by winning the Paris Masters - and breaking a run of European success at Masters events stretching back to 2010.

Fascinatingly, the pair could meet again in the final, should Zverev beat Jack Sock on Friday to book his spot in the last-four. Sock defeated Cilic in the early match, with Federer's victory eliminating the Croat. "Obviously he won it".

The top two players from each of the two groups of four will progress to the semi-finals.

The 36-year-old usurped a 4-0 lead to the 6ft 6in bit-hitter, who netted his own set point opportunity at 6-5, and paid the price as Federer took it 8-6 after 54 minutes of spectacular action. "I think if I continue having this level, I don't know, maybe you'll see me on the weekend still". It is nearly as though Federer is having a fairytale year on tour.

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From there on it was all Federer.

Roger Federer was pushed hard by young German Alexander Zverev as he reached the semi-finals of the ATP Finals and he was quick to predict a big future for the 20-year-old.

This week, Sock lost his first match in the Boris Becker group to Roger Federer while Alexander Zverev beat Cilic, leaving both fighting for their lives on Tuesday. Federer tweaked his back during the match and was badly enough affected to spend the next couple of weeks resting up, thus disrupting his preparation for the US Open.

"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.

"I'm happy and relieved that I can play freely against (Marin) Cilic, instead of it being a nail-biter". I'm here to win matches.

"Overall I think he's playing good tennis, quite aggressive". "He is a wonderful guy and a great player".

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