The interim UFC welterweight championship is on the line at UFC 143. The fiery and unpredictable Nick Diaz brings to the Octagon an 11-fight undefeated streak, a win against BJ Penn and an attitude and style like none other for a showdown with “The Natural Born Killer” Carlos Condit, former WEC champion and exciting finisher. Plus, powerhouse wrestlers Josh Koscheck and Mike Pierce battle to make their case for a future shot at the 170-pound title.