He was barking at himself, at his entourage, at a crowd vocally supporting his opponent, Juan Martin del Potro. Three times, del Potro was a point from breaking and earning the right to serve to make it a set apiece. Those were high-risk shots, but, as del Potro put it: "It's the only way to beat these kind of players." Later, after winning a point, Djokovic put that finger to his ear, as if to say, "Who are you cheering for now?!" The tiebreaker was resolved thanks to more del Potro miscues on his forehand side, as he looked more and more fatigued.

Source: Philippine Star September 10, 2018 04:52 UTC