Photographer's brain fade triggers insane Medvedev tantrum: 'WHAT DID REILLY OPELKA SAY?!'

A furious Daniil Medvedev wasn't satisfied with the chair umpire's controversial call. (ESPN)

Extraordinary scenes have unfolded at the US Open on Louis Armstrong Stadium after a photographer mistakenly ran onto the court during match point, sparking a fiery outburst from Daniil Medvedev at the chair umpire.

His opponent, Frenchman Benjamin Bonzi, was leading 6-3, 7-5, 5-4 with a match point on serve, when he was forced to halt his service motion before hitting a second serve when a photographer appeared on the side of the court in anticipation of the match concluding.

"Wait please, not now. Get off the court please," umpire Greg Allensworth told the photographer, who seemed oblivious as to what was going on.

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Allensworth then awarded a first serve to Bonzi, which led to farcical scenes.

"What did Reilly Opelka say? He earns by the match, not by the hour. Umpire just wants to go home," Medvedev said, arguing that the photographer didn't disrupt Bonzi.

The Russian then screamed, "WHAT DID REILLY OPELKA SAY?" three times as he continued to rev up the crowd.

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Earlier this year, world No.67 Opelka called for Allensworth to be suspended by the ATP after receiving a code violation at the Dallas Open when attempting to tell a fan in the stands to be quiet.

"He's real bad," Opelka said when asked about Allensworth. "He almost changed the outcome of that match just because he doesn't really know what he's doing. He got emotional when we were arguing.

"He got very tense and frantic, he couldn't give me an answer. He didn't tell that guy to shut up, he was doing it for three points. He didn't do his job, so I had to tell him, 'Get out of here.' The guy was being pretty quite rude."

The match paused for five minutes as the rowdy American crowd were in no mood to stop making noise, with the match commentator describing it as "a riot".

"I really feel for Benjamin Bonzi I have to be honest," one of the commentators said. "He didn't ask for the photographer to run on the court. He didn't ask for the first serve to be awarded. There's a few fans trying to put him off his second serve which I think is bang out of order."

Medvedev used the raucous atmosphere to his advantage as he grabbed the third set in a tiebreak, with the match now into a fourth set.

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