Best One on One Fight.

Originally posted by MR Potter
The Bride vs 1544546444165 corean or japanese people in kill bill vol 1

timmy vs. jimmy.i guess thats not a movie but screw it.

The Crow vs. Top Dollar

First good one that came to my mind was Ripley vs. Queen Alien in "Aliens".

Classic!

Also...Vader vs. Luke in "Empire" and Spanish swordsman vs. Westley in Princess Bride.

Anakin vs Obi-Wan in Revenge of the Sith

Here are ten more. films.
"The Black Swan" Tyrone Powers vs. George Sanders
"Dune" Kyle Maclahlan vs. Patrick Stewart and Kyle Maclahlan vs. Sting
"Giant" Rock Hudson vs. Mickey Simpson
"Lionheart" Eric Stoltz vs. Gabriel Byrne
"Night and the City" Stanulas Zbyszko vs. Mike Mazurki
Pirates of the Caribbean" Curse of the Black Pearl" Johnny Depp vs. Orlando Bloom
"Play It to the Bone" Antonio Banderas vs. Woody Harrelson
"Scaramouche" Stewart Granger vs. Mel Ferrer
"Siren of Bagdad" Hans Conreid vs. Charlie Lung
and "Zorro" Alan Delon vs. Stanley Baker

Enjoy.

The Narrator V. Tyler Durden in the end of Fight Club was excellent.

As Mediochre as The Patriot was, Mel Gibson V. the Calvary dude was fun

Hmmm....

Neo vs. Smith (Matrix)
Luke vs. Vader (ESB)
Westley vs. Inigo (Princess Bride)

Just a few off the top of my head.