Roger Federer said he was relieved the match was over after struggling in humid conditions and falling to one of his most surprising losses against John Millman at the US Open. Australian Millman had been given barely a sniff before the match, with excitement already building for a quarter-final clash between Federer and Novak Djokovic at Flushing Meadows.

The 29-year-old, who had never previously beaten a top-10 opponent, appeared to have even less chance of winning with Federer a set and a break up and holding two set points, but he somehow clawed his way back to clinch a 3-6, 7-5, 7-6 (8/6), 7-6 (7/3) victory. While Millman, ranked 55, produced the performance of his life, Federer gave one of his poorest displays on the big stage, struggling with all parts of his game and making 76 unforced errors.