Superman vs...
Scenario is this: Superman comes to Marvel Universe earth.
He has decided that's it for the alternate Earth, and sets up a tournament for people to come try and stop him. If he isn't stopped, he will hurl the Earth into the sun.
Matches are 1v1 versus any hero / villain that is currently present on Marvel Earth, nobody else (so eliminates Silver Surfer, Odin, etc.).
Who would be able to stand up to him to stop him that's located on Marvel Earth?
Rules: There is presently no Kryptonite on Marvel Earth, and the sun provides the same sustenance that the DC sun provides. Superman is considered fully charged. No hero or villain will have any prior knowledge of Superman for the purpose of this fight. Anybody who rises to the challenge has one hour's worth of prep before the fight.