Although I believe saitama wins, raditz has way more expirience, skill, technique, versatility, range, flight, and whatnot, so the battle will be very dragged out.... Cuz saitama can only punch, jump, run... And punch again, if need be, so raditz will have the edge at the start, but if it takes to long, he will lose. BUT saitama doesnt Dodge, so he will be in danger if raditz go (literally) ape shit on him (by that I mean oozaru mode, for all the noobs out there which has a legit 10x multiplier, and I doubt that saitama could fight against ten raditzs)