Demetrious Johnson thinks Floyd Mayweather would be EASY WORK in the octagon -- telling TMZ Sports he'd obliterate the boxing superstar if the two clashed in the UFC.
After Dana White confirmed he was talking with Floyd about a "UFC deal" ... DJ immediately threw his name in the mix as a possible first opponent.
In fact, Mighty Mouse joined the guys on the "TMZ Sports" TV show (airs weeknights on FS1) and broke down exactly how he'd punish the 40-year-old.
As for Floyd, he told FightHype.com he's not planning on an MMA fight -- but he also insisted he wasn't coming out of retirement to box Conor McGregor ... and we all know how that turned out.
Waiting for your permission to load the comments.