Samus Aran vs. Sam Gideon
Metroid's protagonist against the star of Vanquish in two specific rounds:
Round 1: Pure melee fight, wearing only their respective suits and with the basic capabilities of said suits (as in, no power-ups on Samus' suit, and Sam's suit has its basic limiters).
Round 2: All-out fight. Sam's got all guns available in the game, DLC guns included, and Samus has her fully-amped power suit, and Sam's ARS limiters are fully disabled.
Since Vanquish was a bit understated (the curse that lots of Shinji Mikami's most original games tend to have), if you don't know who the hell Sam Gideon is, here're a few random vids for an idea of what he can do.