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By Alexander Smith and Cassandra Vinograd

Australian tennis player Nick Kyrgios has been fined $10,000 after on-court microphones caught him making a lewd comment about his opponent's girlfriend during a match in Canada.

The 20-year-old was fined an additional $2,500 for "unsportsmanlike conduct" relating to a comment made to a ball-person during the match, the Association of Tennis Professionals (ATP) said in a statement Thursday. The ATP added it was investigating whether Kyrgios' actions demanded a more severe penalty.

Kyrgios, currently ranked 41st in the world, was playing No. 5-ranked Stanislaws Wawrinka in second-round match of the Rogers Cup in Montreal on Thursday when on-court microphones picked up his crude remark about another player sleeping with Wawrinka's girlfriend.

Kyrgios has since apologized on Facebook, saying his remarks toward double grand-slam winner Wawrinka were made "in the heat of the moment and were unacceptable on many levels."

Nick Kyrgios before his match against Fernando Verdasco at the Rogers Cup in Montreal on Tuesday.Minas Panagiotakis / Getty Images

He said he also made a private apology to his opponent and would "take full responsibility" for his actions.

Wawrinka, 30, said on Twitter that Kyrgios 's on-court remarks were "so low" and "beyond belief."

"So disappointing to see a fellow athlete and colleague be so disrespectful in a way I could never even imagine," he added. "What was said I wouldn't say to my worst enemy."