Federer cruised to a routine 6-4 7-6 (7-4) win over Jack Sock at the ATP finals, but missed one of the easiest points of his career during the match. With his rival stranded at the net and with an easy ball to put away Federer fluffed it into the net, but he had an excuse, with Sock's "very big bottom" putting him off.
Federer joked after the match about the incident: "It was a big distraction, I’ll tell you that, because it was very big. That’s what I should have aimed for. That target was bigger than the down-the-line court that I had"
It turns out that it's not the first time Sock has used his posterior distraction technique, with the American admitting afterwards: "‘It’s happened sometimes in the past, but not on a big stage like this.’ Sock was pleased that his surprise tactic had worked, but said he wasn't planning to bring it out much in the future: "I mean, I did it more for fun,’ he added. ‘Probably do it three times a year. No, it’s not a normal tactic."