Roger Federer is the latest tennis player to condemn controversial Australian Nick Kyrgios over the comments he made during a match at the Montreal Masters.
The 20-year-old Kyrgios was fined $US10,000 after microphones on court heard him tell Stan Wawrinka, Federer's Davis Cup teammate, that "(Thanasi) Kokkinakis banged your girlfriend".
Federer said that the incident was "not great for the sport, one that I think many players have tried to build up and make it a good image, build up a good image."
"We all agree that he definitely crossed the line by a long shot," Federer told the Cincinnati Enquirer.
"We're not used to that kind of talk in tennis. I know in other sports it's quite common, maybe normal. Not in our sport, really.
"It's normal that the tour comes down hard on him and explains to him that it's not the way forward."
"We want kids to be wanting to get into this sport because it's a nice sport."
Federer’s long-time rival Rafael Nadal hasn’t commented on the Kyrgios incident in particular, but agreed with the 17-time grand slam winner that young players’ conduct is affecting the image of tennis.
"Being young is not an excuse at all. I started at age 16, other top players arrived at a young age," Nadal told reporters at the Cincinnati Masters, where both he and Federer are competing this week.
"I don't want to say much about this, but when we (say) things on the court, we are in front of the cameras and the audience – and most important we are in front of kids.
"This sport has always been gentlemanly. It's about respect shaking hands after the match and being respectful with umpires and the opponent and with the crowd.
"If we want to keep the game like this, we need to be strong when all this (controversial) stuff happens."