Reilly Opelka of the U.S. plays a forehand return to Tomas Machac of the Czech Republic during their second round match at the Australian Open tennis championship in Melbourne, Australia ...

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

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.

DALLAS — Reilly Opelka faces potential discipline ... The ATP will review Mr. Opelka’s post-match comments as part of its standard disciplinary process.” After the match, Opelka said umpire ...

DALLAS — Reilly Opelka faces ... Afterward, Opelka said umpire Greg Allensworth failed to do his job. The ATP says it will review Opelka's post-match comments as part of the disciplinary process.