BJ Penn and Caol Uno met twice in the UFC (and almost a third time) before those two historic matches in the octagon, ending first with a highlight reel KO, and followed by a five-round war for the lightweight title.
MMAmania's Brian Hemminger takes a closer look at Saturday night's UFC on Fox 5 main card bout between rising Rory MacDonald and the legendary B.J. Penn in the welterweight division. What's the key to victory for both men? Find out inside.
Get a complete breakdown of the first portion of UFC on FX under card fights that will air on FUEL TV -- Nick Denis vs Joseph Sandoval, Daniel Pineda vs Pat Schilling and
Fabricio Camoes vs Tom Hayden -- from the Bridgestone Arena in Nashville, Tenn., on Jan. 20, 2012.