MONTREAL
French Open champion Stan Wawrinka has urged tennis authorities to take action against Nick Kyrgios for an ''unacceptable'' comment during a match at the Rogers Cup.
Wawrinka wrote on his Twitter account Thursday that the Australian's words were ''not only unacceptable but also beyond belief.''
A courtside microphone picked up Kyrgios saying that Australian player Thanasi Kokkinakis had slept with a player who is reportedly Wawrinka's girlfriend.
Kyrgios wasn't apologizing afterward, either. "He was getting a bit lippy at me so, I don't know, it's just in-the-moment sort of stuff," Kyrgios said. "I don't really know, I just said it."
That's what happens when you get lippy. https://t.co/KPgzVSGYzP
— Christos Kyrgios (@xkyrgios) August 13, 2015
Wawrinka wrote on Twitter: ''There is no need for this kind of behaviour on or off the court and I hope the governing body of this sport does not stand for this.''
Wawrinka's coach also took exception.
The ATP rule book allows a fine of up to $10,000 for incidents of verbal abuse or unsportsmanlike conduct.
The rules note that a "singularly egregious, a single violation of this section shall also constitute the player Major Offense of Aggravated Behavior."
Kyrgios beat Wawrinka on Wednesday when the Swiss retired with a lower-back injury while trailing 4-0 in the third set.
The fifth-ranked Wawrinka announced in April that he had separated from his wife, with whom he has a daughter. Wawrinka has since been linked with 19-year-old Donna Vekic of Croatia, who is ranked 127th.
Vekic played mixed doubles with Kokkinakis, also 19 and ranked No. 76, at the 2014 Australian Open as a wild-card entry.
At Wimbledon last month, Kyrgios was booed by spectators in a fourth-round loss to Richard Gasquet of France. Kyrgios appeared to make little attempt to return Gasquet's serve during the third game of the second set after a dispute with the chair umpire.
That incident prompted Australian swimming great Dawn Fraser to question the character of Kyrgios and suggest he could leave the country and return to where his parents came from.
Kyrgios, who was born in Australia to a father born in Greece and mother born in Malaysia, replied on Twitter that Fraser was a "blatant racist." She later apologized.
