Novak Djokovic racked up his 50th win of 2015 to reach the quarter-finals of the Montreal Masters and then blasted Nick Kyrgios for the crude sexual slur at Stan Wawrinka which has rocked the sport.
The top seed, and three-time champion in Canada, scored his 28th consecutive victory at the Masters level by seeing off Jack Sock of the United States 6-2 6-1.
The win, in just 54 minutes, put the world No.1 Serb into the last eight against Latvian qualifier Ernests Gulbis.
Second seed Andy Murray, who is chasing a third title in Canada, also took his season’s win tally to 50 with a smooth 6-3 6-2 triumph over Luxembourg’s Gilles Muller.
Djokovic lashed out at Kyrgios who was fined $US10,000 ($A13,550) for an obscene sexual remark made in Wednesday’s third round.
On-court microphones picked up the remark made by the 20-year-old Australian concerning Wawrinka’s girlfriend.
Kyrgios said that the woman had been involved with his close friend Thanasi Kokkinakis.
“Sorry to tell you that mate,” Kyrgios is heard to say with his back turned to the French Open champion.
Djokovic, a close friend of Wawrinka, said Kyrgios deserved to be punished.
“Some players have problems to control themselves on the court. Sometimes when you go through the emotional challenges, it slips out of your mouth,” said the top seed.
“But again, there’s no excuse for what he has said.”
Wawrinka, who separated from his wife earlier this year and has been linked to Croatian tour player Donna Vekic, said the ATP should take “major action this time”.
As well as the maximum $10,000 on-site fine, the ATP said they could not rule out further sanctions.
“He was fined, he deserved it,” added Djokovic.
“I think he’s going to learn a lesson in a hard way. Hopefully this won’t happen to him anymore.
“I understand that every player goes through certain tantrums, emotional ups and downs during the match. In a big fight and at this level, I understand.
“But it’s not, I would say, fair, and there’s no excuse of directing your tantrums to your opponent, especially to somebody that is not even there.”
Djokovic said Kyrgios, fast earning a reputation as the sport’s bad boy, remains one of the potential future stars of the sport.
“He’s young, he’s definitely one of the players that everybody’s looking to.
“His quality of tennis is really remarkable for his age. He’s doing very well.
“I’ve never had any problems with him personally. Off the court we had nice chats, practised with each other.”
Kyrgios is due back on court later Thursday against John Isner of the United States.
The winner will face Frenchman Jeremy Chardy who overcame Ivo Karlovic 4-6 7-6 (7/1) 6-4 after the Croatian had passed the 10,000-ace career mark during his win in the previous round.
Murray, the 2009 and 2010 champion of the Canadian event, will face defending champion Jo-Wilfried Tsonga or Australian Bernard Tomic in the quarter-finals.