Marvel/DC Boxing match!
The rules of boxing apply, only punches are allowed (no other powers are allowed except inherent powers such as healing and invulnerability), inside a ring (4x the size of a regulation boxing ring) enclosed in an impenetrable forcefield. Since this is boxing, skill, agility, endurance are important factors to consider aside from strength. Victory is by knockouts only.
Super Heavy Weight:
Odin, Thanos, Tyrant, King Thor, Champion, Darkseid
Heavy Weight:
Superman, Gladiator, Thor, Silver Surfer, Beta Ray Bill, Shazam, Hercules, Hulk
Middle Weight:
Namor, Thing, Colossus, Iron Man, Wonder Woman, Wonder Man, Warpath, Rhino, Carnage
Light Weight:
Captain America, Black Panther, Azrael, Batman Beyond, Spiderman, Wolverine, Bane
For each weight class pick the winner and runner up. Remember, this is a BOXING match, not an all out fight.