Rocket Penguin

Ya, know if I was a boxer I would pretend to be gay. In a team sport especially hockey or football claiming to be gay would be suicidal, but in boxing what are they going to do? Beat you up? I think it would actually help your career to pretend to be gay in boxing.
First of all no matter what, you would win. If you lose, people would say that considering the adversity you had survived, you were brave just for stepping into the ring. If you won, then heh, that guy got beat up by a gay guy.
You would get paid more money for fighting. It's a promoter's dream. Some people would tune in just to support a gay guy. Some people would tune in just to see a gay guy get beat up.
The only downside that I can think of is that your ring name wouldn't be very snazzy. You couldn't be Johnny "Night Train", or "The Hammer." No matter what you called yourself people would name you something else. "Tonight we pit "Iron" Mike Tyson against Johnny "The Fighting Fairy" Smith.

**Update***
Maybe "Fuchsia" Freddie Smith would be a better name
If being in the closet is pretending to be straight when your gay, what do they call straight people who are pretending to be gay? In the living room? "Oh he's a breeder, just look at his shoes. They don't match those pants at all."