US Open 2018: Roger Federer knocked out by Australian John Millman

US Open 2018: Roger Federer knocked out by Australian John Millman

US Open 2018: Roger Federer knocked out by Australian John Millman

Next up for Keys, who was routed by Sloane Stephens in last year's final, is the victor of the evening clash between five-times Grand Slam champion Maria Sharapova and Spanish 30th seed Carla Suarez Navarro.

Cilic, who beat Nishikori four years ago for his only major title, was a 7-6 (6), 6-2, 6-4 victor against No. 10 David Goffin, while Nishikori advanced by defeating Philipp Kohlschreiber 6-3, 6-2, 7-5.

Should Federer get through against the 55th-ranked Australian, he'll set up his earliest Grand Slam meeting with Djokovic since 2007, when Federer beat Djokovic to reach the Australian Open quarter-finals.

"I'm probably in a little bit of disbelief", said Millman. "But you know I have so much respect for Roger and everything he's done for the game".

Millman cursed himself for missing one set point but threw everything into a series of forehands to bring up a second and forced Federer into another error.

For his troubles, John Millman - whose rabid fanbase are called Millminions for what it's worth - now faces another huge task in sixth-seeded Novak Djokovic in his quarter final matchup. "He's been a hero of mine and today he was definitely not at his best but I'll take it".

That proved to be all Federer needed as he clinched the first set.

Many labelled Federer's performance in the match as one of the worst of his career.

Keys started the match by holding in the first game and then doubled her lead after a 14-minute game that featured four game points for Cibulkova, who was baking on the sunny side of the court, and five break points for the American.

The 13-times grand slam victor had made easy work of the opening set, breaking Sousa twice, the second time to close out the set.

His match didn't get to the point of a heat interruption, because he wrapped it up in straight sets, but that did come into play for a couple of women's matches.

He said: "I prefer not to talk about how hard it was". Bloody go you good ass thing.

Roger Federer served poorly. A Federer double-fault enabled Millman to pull even at 5-all and Federer lost his serve again when his backhand sailed long, evening the match at a set apiece.

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