Nick Kyrgios has apologised to Stan Wawrinka after his sledging drew criticism and a huge fine from the ATP.
The controversial 20-year-old courted more criticism after alleging that teenage Australian player Thanasi Kokkinakis had slept with the French Open champion's partner.
Wawrinka, who left his wife earlier this year and has subsequently been linked with the Croatian player Donna Vekic, did not appear to hear what Kyrgios said at the time, but the words were picked up by an on-court microphone. The world No 5 was furious at his post-match press conference and called on the ATP to take action against Kyrgios.
"What was said I wouldn’t say to my worst enemy," Wawrinka said on Twitter. "To stoop so low is not only unacceptable but also beyond belief."
Kyrgios took to Facebook to apologise.
"I would like to take this opportunity to apologise for the comments I made during the match last night vs Stan Wawrinka," the Australian wrote.
"My comments were made in the heat of the moment and were unacceptable on many levels. In addition to the private apology I’ve made, I would like to make a public apology as well. I take full responsibility for my actions and regret what happened."
The Australian tennis player's trash talking was picked up by a court-side microphone at the hard court event, which is one of the major tournaments in the build up to the US Open.
Watch the incident below...
According to the ATP rule book players can be fined up to $10,000 (about £6,400) for verbal abuse or unsportsmanlike conduct. The ATP, which organises the men’s tour and represents both players and tournaments, said that it had fined Kyrgios for his comments. “Further details on the fine will be made after that player has been notified,” a spokesman said.
Wawrinka wrote on Twiitter after the match: "So disappointing to see a fellow athlete and colleague be so disrespectful in a way I could never even imagine.
"What was said I wouldn't say to my worst enemy.
"To stop [sic] so low is not only unacceptable but also beyond belief.
"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 and stands up for the integrity of this sport that we have worked so hard to build."
Nick Kyrgios: His most controversial moments
Nick Kyrgios: His most controversial moments
1/10 Nick Kyrgios controversy
In the same year as stunning Rafael Nadal in the fourth round of Wimbledon 2014, Kyrgios was penalised an entire game after being slapped with a third code violation in a single match. Since breaking onto the scene the young Australian has been persistently warned about his language.
2/10 Nick Kyrgios controversy
During his first-round match at Wimbledon 2015, Kyrgios was heard saying 'dirty scum'. He had to defend himself after the win over Argentinian Diego Schwartzman, insisting the words were not aimed at the umpire but himself.
3/10 Nick Kyrgios controversy
During a match with Milos Raonic, Kyrgios was given a code of conduct warning after throwing his racket into the ground with so much force it bounced over a fence and into the arms of a spectator at the All England Club.
4/10 Nick Kyrgios controversy
In the same match against Raonic, Kyrgios confronted a fan in the crowd. 'I thought she said something like, 'Pull your head in'. She started laughing. I didn't really find it funny,' he said after the match. 'It's easy when you're just sitting there and you're just watching, when you've got no experience at all on the court.
5/10 Nick Kyrgios controversy
Kyrgios became an ambassador for headphone company Beats By Dre - but even that caused a stir. The marketing was titled Play By Your Own Rules, highlighting Kyrgios' lack of respect for the traditional etiquette of the game - something which irked some tennis fans.
6/10 Nick Kyrgios controversy
After being called out by a line judge for bad language at Wimbledon this year, Kyrgios remonstrated with the umpire. 'What did he just say to you? Does it feel good to be up there in that chair? Does it make you feel strong?' he said.
7/10 Nick Kyrgios controversy
The Aussie encouraged fans to smear Vegemite and other spreads on their faces after one supporter offered to do so. The trend, which seemingly started as a bit of fun, took a turn amid suggestions the gesture could be seen as 'blacking up'. Serena Williams said she would be interested to know why the fans did it.
8/10 Nick Kyrgios controversy
Against Richard Gasquet at Wimbledon, Kyrgios appeared to give up playing entirely after a couple of calls went against him and being warned by the umpire for an audible obscenity. With his opponent serving, Kyrgios hardly bothered to try and return. He lost the match.
9/10 Nick Kyrgios controversy
Olympic swimming champion Dawn Fraser claimed Australia's young tennis stars should set a better example or 'go back where their parents came from'. She later apologised whilst Kyrgios labelled her a 'blatant racist.
10/10 Nick Kyrgios controversy
At the Montreal Masters he told opponent Stan Wawrinka that Thanasi Kokkinakis 'banged your girlfriend'. Wawrinka was furious with the sledge and urged the ATP to take action.
Wawrinka progressed in the tournament after Kyrgios retired despite leading 6-7, 6-3, 4-0.Reuse content