Mayweather Hit with Lawsuit Before Big Fight

Floyd Mayweather Jr. is already bobbing and weaving -- and he doesn't even fight Juan Manuel Marquez until tonight.

Mayweather has been sued by a law firm in Las Vegas for allegedly not paying them for some legal real estate work.

They are suing for $10,000 -- plus interest and costs. Mayweather reportedly will make a minimum of $10,000,000 for tonight's fight, so 10k should be no sweat off his back.