Reilly Opelka faces potential discipline for his post-match comments about a chair umpire he called the “worst ump on tour.”

Reilly Opelka criticized chair umpire Greg Allensworth following a match at the Dallas Open. Opelka was penalized for swearing at a spectator he claimed was disturbingly disruptive. The ATP is considering disciplinary action,

Reilly Opelka called for chair umpire Greg Allensworth to be suspended by the ATP after Opelka received a code violation at the Dallas Open for confronting a spectator in the stands who he claimed was deliberately coughing to interrupt his serve.

Opelka criticized the umpire after he was penalized for twice swearing at a spectator, describing him as 'amateur hour' and 'bush league.'

Reilly Opelka's win over Cameron Norrie at the Dallas Open ended in controversial fashion and the American didn't hold back in his criticism of chair umpire Greg Allensworth after the match.

The 211cm American let rip at the chair umpire over his lack of action against a fan heckling him from the stands.