Former World No. 1 and five-time champion Roger Federer crashed out of the US Open, losing 6-3, 5-7, 6-7, 6-7 to John Millman of Australia in the fourth round of the tournament on Tuesday. Throughout the match, Federer, who was making unusual choices in his stroke-play, appeared to be having some sort of issue with his health, but what eventually proved to be his undoing was the 76 unforced errors he committed in the match.