Cincinnati: Multiple Grand Slam winner Roger Federer said the sport of tennis cannot afford to tolerate Australian Nick Kyrgios' behaviour adding that the Association of Tennis Professionals (ATP) should 'come down hard' on the controversial 20-year-old.

Kyrgios was fined $12,500 by the ATP and further punishment may still be forthcoming after he jibed at his opponent, World No.5 Stan Wawrinka of Switzerland during a match in Montreal last week that "(Thanasi) Kokkinakis banged your girlfriend. Sorry to tell you that, mate".