Sonic the Hedgehog vs Mario

Sonic is fast, but not strong. Mario could wet the area around him with FLUDD and that would really slow down Sonic. He may be sure-footed, but at that speed, I don't think Sonic could use his full speed. Then, there's the Invisible Cap.

Mario slowed Sonic, made himself invisible to Sonic and then he could either: 1) nail him with Fireball or 2) slam the punk to the ground. Hell, grab him, fly up and plunge back to the ground, making a hedgehog pie.