The interim UFC welterweight championship is on the line at UFC 143, as the fiery and unpredictable Nick Diaz brings an 11 fight undefeated streak, a win over BJ Penn, and an attitude and style like no other into the Octagon for a showdown with "The Natural Born Killer," former WEC champion and exciting finisher Carlos Condit. Plus, powerhouse wrestlers Josh Koscheck and Mike Pierce battle to make their case for a future shot at the 170-pound title. UFC 143: Diaz vs. Condit - Saturday, February 4th, live on Viewers Choice