Daniil Medvedev rages at Nick Kyrgios' box in US Open controversy

Daniil Medvedev threatened to quit his match against Nick Kyrgios at the US Open on Sunday unless someone from the Aussie star's entourage wasn't asked to leave.

Kyrgios shocked the World No.1 in four sets in New York to storm into the quarter-finals and leave the tennis world stunned.

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It was his fourth career victory over Medvedev and the third time he has beaten a current World No.1 - the first being his famous win over Rafa Nadal as a teenager at Wimbledon in 2014.

In an explosive encounter laced with controversy and drama, Kyrgios risked being defaulted and overcame a running verbal battle with the chair umpire before ousting the top seed 7-6 (13-11) 3-6 6-3 6-2.

It was the Aussie star's second win over Medvedev in the last three weeks and vaulted Kyrgios into the quarter-finals at Flushing Meadows for the first time in his career.

It wasn't long before tensions boiled over in the match, with Medvedev fuming at the umpire for not warning Kyrgios after the Australian went within centimetres of hitting a ball into the first row of the stands, and likely a spectator.

Luckily for Kyrgios the ball hit the back wall, but could have ended in disaster if it was a bit higher.

Medvedev then threatened to quit the match if someone from Kyrgios' courtside entourage - which included girlfriend Costeen Hatzi - wasn't ejected.

The Russian star complained that someone was disrupting him between his first and second serves.

"They cannot do it," Medvedev raged at the umpire.

"If they do it a second time, I am not playing they're out, until somebody is out."

Nick Kyrgios overcomes brain fade and umpire battle

Kyrgios received a standing ovation from the Arthur Ashe Stadium crowd after winning a pulsating opening set that stretched more than hour.

He looked to have thrown it away after giving up a 4-2 lead and then a 4-1 advantage in the tie-breaker, not to mention engaging in an unnecessary, elongated exchange with Greek umpire Eva Asderaki-Moore over the shot clock.

"You are the only umpire that I've a problem in this matter," Kyrgios fired at her.

"Use your common sense. Just use it a little bit."

After levelling the match at one-set apiece, Medvedev received an extraordinary gift from Kyrgios when the Aussie ran around the net and hit a ball on the wrong side of the court.

After looking to have earned a break point in the second game of the set when Medvedev couldn't return a ball, Kyrgios ran around the net celebrating and hit the ball away for a mock winner.

Asderaki-Moore awarded the point to Medvedev because the Russian's shot, while clearly not going over the net, was "still in play".

"I thought it was legal," Kyrgios admitted afterwards, shaking off the blunder before breaking Medvedev on his next service game to claim a 3-1 lead, then going on to seize a two-sets-to-one lead.

Kyrgios turned the screws with another break in the third game of the fourth set, then received an audible obscenity the following game.

But it didn't matter as the imperious Aussie snared a double break and powered to a 20th victory in his past 23 matches after three hours and 53 minutes.

Kyrgios now shapes as a serious contender to win the title having finished runner-up at Wimbledon to Novak Djokovic.

with AAP

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