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

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

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

Tommy Paul is through to his second semi-final of the season in Dallas. The Australian Open quarter-finalist faced fellow American Reilly Opelka in the quarter-final and scored a 7-6, 6-2 win in an hour and a half.

Reilly Opelka voiced his frustration after a heated exchange with chair umpire Greg Allensworth at the Dallas Open, refusing to shake his hand.

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 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'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,