Round 1: Match 15
Annakin Skywalker vs. Obi-Wan Kenobi
Movie: Star Wars Episode 3: Revenge of the Sith
http://www.youtube.com/watch?v=pSwy412nttI
Six movies built up to this fight. Two or three of them were really good. But nevertheless, the fight scene is fantastic. It was really close between this and the Kenobi/Jinn vs. Darth Maul fight, but seeing whiny-ass Mannequin Skywalker get his limbs chopped off while his face melts wins out.
VS
Coolie, Donut, and the Tailor vs. the Axe Gang
Movie: Kung Fu Hustle
http://www.youtube.com/watch?v=ZorwMyOyPOk
Kung Fu Hustle had to be in the tournament. The movie, this fight in particular, is one of the rare occasions where comedy, and not just the over-the-top violence or exploitation-referencing style, but actual comedy, is blended with action and it's not just lame slapstick boringness. There's slapstick, yes, but it's neither lame nor boring. Shanghai Noon aside, Jackie Chan wishes his alleged comedies were as funny as this.