MONTREAL, Canada (AFP) — Novak Djokovic racked up his 50th win of 2015 to reach the Montreal Masters last eight 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 number one Serb into the quarter-finals against Latvian qualifer 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 $10,000 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.

Wawrinka, who seperated 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”.

Kyrgios was due back on court late yesterday against John Isner of the United States.

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.