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

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.

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.

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.

Reilly Opelka launched into stinging criticism of chair umpire Greg Allensworth for penalising him following a confrontation with an "idiot" heckling fan.

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.

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. After coming from a set down to take the last-16 encounter to a decider,