Roger Federer suffers a shock fourth-round exit to John Millman in the early hours of Tuesday morning at the US Open.

Roger Federer says he struggled in the humid conditions on Monday night after his fourth-round exit to John Millman at the US Open.

Roger Federer makes one of many net forays against John Millman.

Roger Federer meets fourth-round debutant John Millman for a place in the US Open quarter-finals.

Roger Federer shovels a shot around the netpost at 3-3 in the third set of his third-round match against Nick Kyrgios on Saturday.

Roger Federer fires 51 winners in three-set victory over Nick Kyrgios at the US Open on Saturday.

Roger Federer improves his FedEx ATP Head2Head series lead to 3-1 against Nick Kyrgios with a victory in the third round of the US Open.

Roger Federer leads Nick Kyrgios 2-1 in their FedEx ATP Head2Head series.

Second seed Roger Federer meets Australian No. 30 seed Nick Kyrgios for the fourth time on Saturday.

Roger Federer holds a 6-0 FedEx ATP Head2Head record against Frenchman Benoit Paire.

Five-time US Open champion Roger Federer remains undefeated in first-round matches at the US Open, beating Yoshihito Nishioka Tuesday.

Roger Federer reaches for a smash on his way past Japan's Yoshihito Nishioka in the opening round of the US Open.

Roger Federer will begin his 2018 US Open campaign against Japanese Yoshihito Nishioka.

After losing to Novak Djokovic on Sunday, Roger Federer is now 7-1 in Cincinnati finals.

Roger Federer and Novak Djokovic met for the 46th time in Cincinnati in 2018.

Roger Federer earns an eighth appearance in the Cincinnati final.

Roger Federer earns an eighth appearance in the Cincinnati final.

Roger Federer owns a 7-0 record in Western & Southern Open semi-finals.

Roger Federer is going for his eighth Western & Southern Open title this week in Cincinnati.

Roger Federer reaches the quarter-finals in Cincinnati for the 10th time with a win against Leonardo Mayer.

Roger Federer wins his opener at the Western & Southern Open on Tuesday.

Roger Federer wins his opener at the Western & Southern Open on Tuesday in Cincinnati.

Roger Federer extends his win streak in Cincinnati to 11 with victory over Peter Gojowczyk.

Roger Federer's win over Peter Gojowzyck is his first at the Western & Southern Open since winning the title in 2015.

Roger Federer is chasing an eighth title at the Western & Southern Open.