Francisco Rodriguez, ex no.373, came out some years ago. Nice article about him http://www.out.com/entertainment/2008/07/06/love-story
'If [an openly gay player] wanted to practice with other players, they would say, 'No thanks, I don't want to be associated with you,' because people would think they were gay also,' he says. One pro tennis insider isn't surprised by Francisco's assessment. 'The locker room can be a lonely place. For all the camaraderie, it can be isolating,' he says. '[A gay player] is always going to be subject to snide comments. Naked bodies are involved. You know, there are still people who think you can get AIDS off a toilet seat.'
Francisco says just being suspected of being gay means hearing homophobic comments on court. 'During the heat of battle -- as a last resort -- opponents, when they get irritated, go to that. They would call me 'faggot' or 'sissy.' ' How did they know he was gay? They didn't -- but he never had a girlfriend and never talked about girls. 'Tennis players like to have a girlfriend there all the time,' he says.
According to Francisco, being gay is also a potential competitive disadvantage. 'This is the talk in the locker room: If a male player has to play a guy who is [perceived to be] gay, they automatically assume he is weak and they have a mental advantage. When they see who they are playing, they say, 'Oh, he's a sissy, you can't lose to him,' ' he says.