Jack Sock pips Marin Cilic in final-set tie-break

ATP Finals: Jack Sock fights back to sink Marin Cilic and keep SF hopes alive

Cilic faces Roger Federer in his final round-robin match, while Sock will be up against Zverev in London as he attempts to pull off more stunning exploits in what has been a glorious end to the year.

5-7, 6-1 to cement his place in the last four at the O2 Arena in London.

Watch as they tackle some of the most famous phrases to come out of London's East End, with Federer's befuddled response to, "Blimey mate, I'm Hank Marvin" a particular highlight.

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. "I think it's right and fair that it's indoors, as well", Federer said.

But Zverev went to pieces in the tie-break, only to fight back from 2-0 down in the second, capitalising on a noticeable Federer dip including five consecutive missed serves.

Both players could ill afford another defeat after losing their first matches at the O2 Arena and there was a sense of deja vu for Cilic, who led Alexander Zverev 3-1 in the final set of his opening contest before being consigned to defeat.

It means his chances of reaching the last four, which looked far-fetched when he lost heavily to Swiss second seed Federer in his opener on Sunday (November 12), are much improved.

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.

"I think if I do the right things and I play the right tennis, I can give myself a chance to play on the weekend of any tournament", Sock said after the two-hour, 28-minute match.

"I went outside, saw Rafa, saw Dominic, everyone was all bundled up, freezing cold, just wanting to get back inside".

Cilic has now won only one of his eight matches overall at the season-ending tournament.

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

"My coach growing up nicknamed me "showtime" when I was young because I loved playing in front of people".

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

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