Six-times champion Federer had earlier beaten Jack Sock. Well, one positive thing today is that I won a set in the match that I lost, so it could maybe make a difference towards the end.
Aiming to end a sensational year as he began it, Swiss master Roger Federer opened his bid for a seventh ATP Finals title with 6-4 7-6 (4) victory over American debutant Jack Sock on Sunday. "I'm working every day, practising well and just trying to be ready for the action".
The 20-year-old German, ranked three in the world, was hot and cold against Croatia's Marin Cilic but, when it mattered most, he produced his best tennis to win 6-4 3-6 6-4. He played more tournaments.
Federer also had to deal with the heartache of a season-ending injury last term, missing the 2016 Olympics because of vital knee surgery.
Federer's chances of succeeding in the tournament are higher than before as World No.1 Rafael Nadal is unsure of participating due to a knee injury. Taking on the power-hitters from the other Group, or Roger Federer is a whole other story though. "Being here is an important thing but for me the most important thing is everything that happened to me this year, the tournaments, competing nearly every week with a very competitive level of tennis, being healthy until Paris", he said.
More errors had crept into the Zverev game and although the youngster got the help of Hawk-eye to deny Cilic a set point, the Croat soon served out to square the contest.
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" Kim says she feels very connected to the baby and is always checking in with the surrogate so she reckons it's no wonder she's getting sympathy cravings".
The set went with serve thereafter as the Swiss won it 6-4.
Grigor Dimitrov, Alexander Zverev, and Jack Sock are all making their first appearance at the ATP Finals while David Goffin, who played one match as an alternate past year, is enjoying his debut as an outright qualifier for the event.
The imposing Croatian came ever so close to winning a second career Grand Slam, making his debut in this year's Wimbledon final before losing to Federer in straight sets.
"It was a big distraction because it was very big". That's what I should have aimed for.
"He's the No.1 player in the world, had the best season of us all and is a superstar of our game".