Captain America (1968) #271
Cap enters into the "rasslin'" ring in a challenge match against the mystery man known as "X". Cap's got this in the bag... Right?
Wolverine (1988) #160
Logan uses the Ladykillers T and A as combat practice for his face-off against Mister X.
Wolverine (1988) #161
Wolverine gets ferociously feral with Mister X after the villain tries to renounce Logan's claim as "being the best"!
Wolverine (1988) #168
Wolverine, A.K.A. Patch, faces off against old foe Mister X in a gladiatorial contest.