Saitama cancelled a planet buster with the wind from a punch. That's waaaay beyond the physical power of ANYONE in Dragon Ball, who are exclusively strong on energy and weak physically (Yes, Freeza kicked away Vegeta's Galic Gun, but that's more an effect of ki defenses then raw physical power)
There's a reason why a Destructo Disc works on virtually anyone.. Because it's a physical, bladed form of ki. Krilling can cut characters that can tank any energy attack from characters >>>>> him. Indisputable proof of their inferior physical defenses.
Originally posted by XSUPREMEXSKILLZWhen was it implied that Earth was the biggest planet Boros could blow up?
And First Form Frieza casually blew up a planet 10 times bigger than Earth. He's weaker than Namek Saga Vegeta.
The point is that Boros couldn't hurt Saitama, not even close, and Saitama would have killed him with a single volley of punches, were it not for his regen.
So, in short, lets say Vegeta is way stronger then Boros. Being way stronger then him still doesn't register as a blip on Saitama's radar.