Courtesy of US Open Tennis

Daniil Medvedev lost his cool Sunday night at the US Open, leading the crowd in a round of boos for a chair ump -- before he annihilated his racket in a wild post-match meltdown.

The tennis star's outburst began late in his tilt with Benjamin Bonzi at Louis Armstrong Stadium in New York ... after a photographer had left his spot and walked along the side of the court, delaying the action.

The match's official, Greg Allensworth , awarded Bonzi a first serve as a result of the cameraman's actions ... which enraged Medvedev.

The 29-year-old went up to the official and unloaded ... insisting it wasn't the right call. He then turned to microphones behind the chair and yelled, "He wants to go home, guys." Getty

"He doesn't like to be here," he added. "He g

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