It was announced that Diaz would be fighting Joe Riggs at taking place on August 15, in which would have been a rematch of their first fight that took place at UFC 57: Couture vs Liddell 3, in which both fighters fought in the cage and then again at the local hospital later in the evening. The fight would have been for the Strikeforce Welterweight Championship but, Riggs had to pull out of the bout due to an adverse reaction to a drug. Diaz was then scheduled to instead face former IFL Welterweight Champion Jay Hieron for the Welterweight Championship. This fight has since been canceled due to Diaz's failure to attain his license after not attending a pre-fight drug test. Jesse Taylor replaced Diaz and the title was no longer on the line, Hieron defeated Taylor by unanimous decision.