Originally Posted by bjurra
Because it seems highly unlikely that anyone in the top 20 is gay.
1. Most of them have girlfriends or wives. 50 years ago, gay men might have gone through the trouble to have an official female partner in order to submit to the norms of society. In 2012, gay men might be quiet about it but I seriously doubt they arrange a fake relationship, unless they are a Hollywood actor or an American politician.
2. If 5% of all males are gay, that means that statistically 1 player in the top 20 is gay. But that is only if top 20 players are an average of the population (which they are not) and if gay men are as inclined to elite sport as the average male (which they are not).
There is currently one male tennis pro ranked in the top 20 who I believe for certain is not heterosexual he is either gay or bisexual. I won't name the guy's name but according to the articles I have read this male tennis champion's so called girlfriend is just his beard. The girlfriend is actually a family friend and she sometimes shows up to his grand slam semifinals or finals but other than that she's rarely seen. She occasionally shows up to other ATP events. The family of this ATP champion created the girlfriend to give this guy a heterosexual image to hide his homosexuality. The girlfriend was created because the family feared if this guy did come out tennis fans would not accept him being gay or bi.
The problem I have with your answer is since gay male athletes encounter so much prejudice and homophobia there is probably internal pressure at the top of men's tennis for a gay male to stay in the closet. At the highest level I think the PR teams and managers have so much power they keep these guys in the closet.
But remember players ranked in the top 20 are very high profile these guys got PR teams and publicists that craft a heterosexual image for them. Just because a man has a girlfriend and wife does not mean he isn't gay or bisexual.