I think it's a toss up between who would win... If Floyd was retired and was doing this shit, i'd probably have it as Big Show winning.. But as he is still a fighter and needs to protect his image/marketability/reputation (even though this is as fake as a vietnamese rolex), they will have Floyd win by some ridiculous means!

If it was real, Floyd would dance into a corner jabbing, Big show would chase him down, pick him up, flip him over, PILEDRIVER onto his head,,,, pick up his lifeless body, then BACKBREAKER ala "Kickboxer 1" The movie, and Floyd would be left there with only his left leg and right eyeball twitching...