Reilly Opelka faces potential discipline for his post-match comments about a chair umpire he called the “worst ump on tour,” the ATP said in a statement Friday. Opelka was angered that he received a point penalty while serving for the match in the third set against Cameron Norrie at the Dallas Open on Thursday night.

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.'

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

Reilly Opelka faces potential discipline for his postmatch comments about a chair umpire he called the "worst ump on tour."