Frank turns to Superman during the pre-fight instructions and says "And Lennox Lewis took the rise out of ME for wearing tights....!! (Laughs) Hur.....Hur.......Hur ! Know what I mean,Clark !"
More importantly.....Could "Andre The Giant" have beaten Marcia Brady?...or Don Knotts?...or Helen Keller? He is...after all..BIGGER than they are!!!
In the comic, Superman was stripped of his powers. So he's just a big guy with some fighting experience. No powers.