By Rick Reeno and Ryan Burton

Las Vegas - Pound for pound champion Floyd Mayweather Jr. (42-0, 26KOs) had a media gathering at the Mayweather Boxing Club in Las Vegas, and presented a check for a $100,000 to the Susan G. Komen For The Cure Nevada Affiliate, which is a charity that helps breast cancer survivors.

Mayweather emphatically stated that he is only interested in fighting fellow pound for pound champion Manny Pacquiao on May 5th at the MGM Grand. If the fight doesn't take place, Mayweather said that he would have to look to other options. 

"Manny Pacquiao is the only fight I want. But, but, but if he won't fight me then I will have to fight someone else. I have to make a living," Mayweather stated.

The Las Vegas resident said that he hasn't thought about other potential opponents and that all of his focus is on Pacquiao. Mayweather was advised that middleweight king Sergio Martinez offered to come down to a catchweight of 150-pounds to fight him. After hearing this news, Floyd said that he would be interested in the potential match.

"If Sergio Martinez can make 150, we can make the fight, absolutely. There are no excuses. If he can make 150, lets make it happen. I'm a little bit different from the other guys. I think he has a very, very impressive style," Mayweather said.

Martinez returns on March 17th at New York's Madison Square Garden, against tough middleweight contender Matthew Macklin.

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Tags: Floyd Mayweather Jr. , Sergio Martinez