Floyd Mayweather says he never said he had sex with T.I.’s wife Tiny … and claims the audio in the footage posted this morning wasn’t clear.

Mayweather tells TMZ Sports …he ACTUALLY said, “he thinks I was f***ing his bitch.”In the video,

Floyd does try to mutter something before the sex line — but it’s hard to make out.Mayweather adds, “I’ve never been with Tiny sexually. I respect her situation and I think she’s a good person. I would never disrespect a marriage.

“T.I.’s wife Tiny confirms that statement … telling us she’s never had sexual relations with Floyd – and thinks he only spoke out at the presser to get revenge for her BET Awards diss.

As for T.I. … he simply told us, “I hope he is enjoying himself. God bless him.”