Dallas (Texas), Feb. 7 -- Reilly Opelka has called on the ATP to suspend chair umpire Greg Allensworth after he received a code violation at the Dallas Open for confronting a spectator who he claimed was deliberately coughing to interrupt his serve.

The American, 27, beat Great Britain's Cameron Norrie 4-6 7-6 (7-5) 6-4 in a last-16 match that lasted two and a half hours, but was annoyed by a spectator when he was serving for the match, the BBC reported.

At 30-30 he stopped mid-serve and went to speak to a fan and asked if he was coughing on purpose then suggested the fan leave the arena in an expletive-laden outburst.

Allensworth announced a code violation then a point penalty for two audible obscenities after Opelka approached the cha...