Featured on the card was a rematch between former WEC Featherweight Champion Urijah Faber and Jens Pulver. Faber was originally lined up to face Jose Aldo at this event, but Aldo was replaced by Pulver. Aldo was instead moved to a bout with the debuting Fredson Paixao at this event, though Paixao was later replaced by WEC newcomer Rolando Perez due to an injury. The Faber/Aldo matchup would eventually take place at WEC 48 the following year, where Aldo defended his then-WEC Featherweight Championship in a unanimous decision victory.
^For the Lightweight Championship. Bout was stopped after Cerrone landed an illegal knee to the head of Varner while he was on the ground. Since Varner was unable to continue, the bout went to the scorecards.
The following is the reported payout to the fighters as reported to the California State Athletic Commission. It does not include sponsor money or "locker room" bonuses often given by the WEC and also do not include the WEC's traditional "fight night" bonuses.