Originally Posted by Tinkerbell
Dunno if any of these are "the best in anime history"
Top 5, off the top of my head....
Luffy vs. Rob Lucci - One Piece.
Gaara vs. Rock Lee - Naruto.
Gohan vs. Cell - Dragonaball Z.
Hiei vs. Bui - Yu Yu Hakusho.
Kenpachi vs. Nnoitra - Bleach.