Novak Djokovic tames heat and Joao Sousa to make quarters

Novak Djokovic tames heat and Joao Sousa to make quarters

After racing through the first two sets against Germany's Philipp Kohlschreiber he dropped his serve while serving for the match at 5-4 in the third, but managed to prevail 6-3, 6-2, 7-5.

Not since Pat Rafter handed a tantrum-throwing Federer a tennis lesson on the then-18-year-old's grand slam debut at Roland Garros in 1999 had an Australian conquered the great Swiss at a major.

"I prefer not to talk about how hard it was", Djokovic said of the heat after the match. "But you know I have so much respect for Roger and everything he's done for the game".

Despite the applause and gasps from the crowd, as well as his opponent, Federer appeared as cool and calm as ever as he flashed a small smile and walked back to the end of the court ready to commence play again. Millman is ranked No. 55. Federer served 10 double faults and committed a frankly staggering 76 unforced errors throughout the match, which helped pave the way for easily the biggest win of Millman's career.

That was the first time in tournament history that the U.S. Open created an extreme heat policy for men's matches - players can opt for a 10-minute break between the third and fourth sets - similar to what's standard on the women's tour, when there can be a delay between the second and third sets.

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Novak Djokovic, of Serbia, puts an ice towel around his head during a changeover against Joao Sousa, of Portugal, during the fourth round of the U.S. Open tennis tournament, Monday, Sept. 3, 2018, in NY.

Kei Nishikori, runner-up in 2014, was also pleased to get through in three sets in blazing sunshine on Louis Armstrong Stadium. The net is out further and the court is more narrow, so for a shot like this to happen in a practice, you will be running into a fence and you will hit it into the net.

From 40-15 up, Federer missed two set points and double faulted to allow Millman to convert a break point at the ninth time of asking.

Federer punished him by snatching a break of his own but his own struggles returned as he looked to serve out the set.

Federer broke first on the way to a 5-3 lead in the set, but Millman won the last four games, breaking Federer twice.