Floyd Mayweather Jr. apparently concedes T.I. had a solid reason for attacking him in Vegas in May ... because the boxer now proudly claims he had sex with Tiny.

Mayweather was promoting his upcoming fight Friday against Marcos Maidana, when someone yelled, "What about T.I.?" -- referring to the now famous Fat Burger fight.

*DHB Note: Please note the audio is not the greatest, and it has been since reported that Mayweather stated he didn't have sexual relations with Tiny and that this report from TMZ got it wrong.

*This article provided to Doghouse Boxing from our friends at http://www.tmzsports.com/

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