Reilly Opelka was competing against Cameron Norrie in the round of 16 tie at the Dallas ATP 500 event. The American tennis player had lost the first set, but later won the second set in a tiebreaker.

DALLAS (AP) — 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.

Tennis player Reilly Opelka has demanded that the ATP suspend chair umpire Greg Allensworth following a code violation he received at the Dallas Open. The umpire issued the code violation after Opelka confronted a spectator in the crowd, who he alleged was purposely coughing to distract him.

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,

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

Reilly Opelka has called for chair umpire Greg Allensworth to be suspended by the ATP after he 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.

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