Since everybody is avoiding saitama, I say he wins if beerus doesn't destroy the planet. Saitama is more durable than beerus. Remember when saitama let borus (who can also beat beerus) trap him inside that large inceneration beam (look at the environment, it was MELTING METAL) and saitama nothing but take the attacks from borus and the BEAM(he has no hope). Beerus doesn't have an attack on that level. Can he vaporize megaton? NO. Remember when trunks sword defended zamasus energy blade? It means there not producing enough heat. If he did, he would have used it against ssj God goku to test the strength of ssj God goku (who can't survive THAT much HEAT). So saitama will just punch or kick the energy blast beerus throws at him if hes not aiming at the planet with intent to destroy it. (Not saitama but the planet alone) How can he survive an attack from saitama? Saitama is physically more powerful since he survived GETTING HIT TO THE(THE) MOON. What has beerus done besides cause large shockwaves? Nothing on BORUS level. He produced a whole different kind of energy in mid air that's above current of air shaking the earth. He can create electricity which is only produce by forces of greater impacts by a shockwave. Saitama can duplicate borus in strength plus a LOT more. Saitama deflected a PLANET destroying blast at full power of his strength because he can't SENSE power levels like beerus can. So when borus said he's going to destroy the planet the situation became critical for saitama to defend the earth. So he considers anything that can destroy the planet to be LIFE THREATNING. That means NO holding back when all MANKIND is at stake. What about beerus MOVEMENT speed? Saitama is WAY faster than sound speed (Sonic is slow ass hell compared to saitama) which beerus hasn't come close at demonstrating. So saitama will speed biltz him since he's way faster than any of beerus attacks. Can beerus out run his own energy blast? NO. Saitama wins only if beerus doesn't destroy the planet!