T.I. took a swing at Floyd Mayweather Jr. and it caused a chair-tossing brawl in the Fatburger on the Vegas Strip early Sunday morning ... According to several witnesses ... Floyd was eating inside the restaurant when T.I. walked up and started jawing at Floyd. Not clear what caused the beef, but word is, T.I. swung at Floyd ... their giant bodyguards jumped in to separate them ... all yish broke out! At one point you hear Floyd telling at T.I., "control your bitch." Las Vegas PD arrived just as Floyd was leaving and we're told T.I. was already gone. Police confirm a Fatburger employee was slashed during the fight, but he refused treatment and did not want to cooperate with investigating officers.

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                                 Is This The Photo That Set Things Off?