I'm not a big fan of 1-on-1 fighting games, but I did play several back in the day which I would still enjoy playing:
*Real Bout Fatal Fury (PS1) - Duck King is always my character ("Wonder-ful!")
*Tobal (PS1) - Love the one on one mode, but the dungeon mode is an absolute peach.
*Ergheiz (PS1) - Same as Tobal.
*Human Killing Machine (ZX Spectrum) - Kick a dog which looks like a sheep and flops like a fish to death. DEATH.
*Tatsunoko Vs Capcom (Wii) - this is an absolute gem, love playing as the Yatterman characters or Frank West.
That 2600 boxing game was sweet back in the day, loved the sound effects.