Rogol Zaar vs. One Punch Man

Both only wear shorts.

OPM wins, with ease. He's like a poor man's Superman (A decently written poor man's Superman, Bendis doesn't count.)

One Punch Man stomps him and all of his enemies and friends at the same time.

Agreed.

Except for the original, of course. The man with infinite power, who only appears to have limits due to his restaint, Superman.

Rogol Zaar stomps. easily.