German tennis legend Boris Becker believes Daniil Medvedev should seek "professional help" after the Russian crashed out of the US Open following the latest in a long line of spectacular on-court meltdowns.

Medvedev was at the centre of extraordinary scenes during his late-night battle with France's Benjamin Bonzi on Sunday, losing in five sets in a game that descended into chaos during the third set.

The drama unfolded when chair umpire Greg Allensworth awarded Bonzi a first serve as he served on match point after a photographer mistakenly wandered onto the court.

That ruling sparked a furious reaction from Medvedev, who unleashed an angry tirade at Allensworth, accusing the official of wanting to end the game early.

"Are you a man? Are you a man?" Medvedev ranted. "He wants to go hom

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