I retract all my picks. This wins.
I’m going to second Darth Maul versus Obi-Wan and Qui Gonn, it didn’t quite make Episode 1 watchable but it nearly did and that itself is an accomplishment. I though Jango versus Obi-wan was pretty good, as was most of the fights in Gladiator (especially the one where Russel Crowe takes out the guards who were going to cut his head off.)