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 .