Appart from Saitama being a "Gag-character" in many regards,
his bare jump has scarred the surface of the Moon.
Maybe if Superman flies in the orbit and has direct sun-light colliding with him, he could resist Saitama for a bit.
Ah~ah and why am I even...? Making Saitama face off against more balanced people is so senseless. He is just too far ahead.