Wawarinka incensed by Kyrgios remark

Dual grand slam winner Stan Wawrinka has slammed Nick Kyrgios after the Australian's astonishing sledge, calling on the governing body to take firm action against a player he said "has big problems".

Wawrinka claimed Kyrgios tried to avoid him after the incident, but the Swiss veteran "confronted him".

"It will stay in the locker room," he said. "But I think there are things, regardless of who you are, regardless of the stress you have on the court, there things that you just can't say. And regardless of whether or not he sidesteps it, I think the way he behaves on the court, he has big problems."

After losing the first set, Kyrgios muttered: "Kokkinakis banged your girlfriend. Sorry to tell you that mate".

The moment caused social media to go into meltdown and sparked heated reaction worldwide, most condemning the controversial player from Canberra.

Kyrgios was referring to Australian colleague Thanasi Kokkinakis and 19-year-old Croatian player Donna Vekic, who has reportedly been dating Wawrinka following the end of his marriage to Ilham Vuilloud earlier this year.

In an on-court interview immediately after the match Kyrgios was asked about his comment.

"I thought he was getting a bit lippy at me, so I don't know, it's just in the moment sort of stuff. But yeah, I don't really know. I just said it," he said.

Wawrinka also took to Twitter to express his disappointment.

"I just hope that the ATP will take big measures against him because he's young, maybe - but there's no excuse. Every match, he has problems. Every match, he behaves very badly," he said.