The No. 8-seeded player defeated Wimbledon finalist Marin Cilic 5-7, 6-2, 7-6 (4) on Tuesday.
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.
The season-ending extravaganza ATP Finals ends another memorable year which will be covered via our website www.skysports.com/tennis with live blogs, reports, reaction and expert analysis as the season reaches its climax.
But Sock somehow raced to the dying ball and clipped it back into the open court to draw level, before seizing the momentum to win the next three points and the match.
"Overall I think he's playing good tennis, quite aggressive".
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The top two players from each group qualify for the semi-finals and with top seed Rafa Nadal pulling out through injury Federer is now a massive odds-on favourite to win the tournament.
Statistically, the last qualifier for these finals was evenly matched with Cilic during the match, but after a run of seven wins in nine matches, his self-belief was high.
Despite having been forced out of bed in the early hours of Tuesday morning by a fire alarm at his hotel, Sock made a fast start - breaking in the opening game, only to hand it straight back to his opponent. It's an awesome atmosphere here and I love playing in London and in front of the fans here. "I'm living my dream right now and I wanna keep on going".
The Croatian fell to third seed Alexander Zverev on Sunday after leading by a break in the third set.
The American No 1 increased his advantage in the second set with a further break of the Cilic serve to move 4-1 ahead before he served out in style with an ace to force the deciding third set - the fourth time already this week that a match has gone the distance. My coach growing up nicknamed me "Showtime" because I love playing in front of people, and there is always a lot going on.
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