Hopefully this hasnt been done before, I didnt a search but didnt find it.
Batman (Bruce Wayne) vs Superman
-Superman with no powers, same physical characteristics as Bruce
-both get a GL ring
-both get 1 month to train in some remote, uninhabited solar system, with 10 planets and an asteroid belt to practice on. =)
-no other prep, equipment, or help allowed. Training is by themselves, but they do get a 10-page "Quick Start" pamphlet explaining how the ring works.
-fight takes place in a remote uninhabited galaxy. They start 1,000,000 km away from each other.
-both bloodlusted. Victory by death, lobotomy, amputation of ring arm, permanent imprisonment inside black hole, or tap out.