Welterweights Josh Koscheck, Jake Ellenberger Collide in UFC 151 Co-Headliner

Headlined by a light heavyweight title confrontation between reigning UFC champion Jon Jones and ex-Strikeforce king Dan Henderson, the evening's main draw airs live on pay-per-view. The event will also see WEC lightweight veteran Danny Castillo lock horns with “Ultimate Fighter” Season 12 runner-up Michael Johnson, while Takeya Mizugaki and Jeff Hougland face off in a 135-pound affair.

Koscheck, 34, enters the cage coming off a contentious split decision defeat at the hands of fellow contender Johny Hendricks at May's UFC on Fox 3. “Kos” had won back-to-back fights prior to his defeat to Hendricks, knocking out former two-time UFC champion Matt Hughes last September before kicking off 2012 with a split decision win over highly-regarded grinder Mike Pierce on Feb. 4 at UFC 143.

Ellenberger also steps into the Octagon fresh off a defeat, as “The Juggernaut” suffered a second-round technical knockout loss to Martin Kampmann on June 1 at “The Ultimate Fighter 15” Finale. Kampmann's come-from-behind victory snapped a six-fight winning streak for Ellenberger, who earned wins over Sean Pierson, Jake Shields and Diego Sanchez in his three bouts leading up to the loss.