Strikeforce: Payback was a mixed martial arts event held on October 3, 2008. The event was produced by Strikeforce and took place at the Broomfield Events Center in Broomfield, Colorado. It marks the first time Strikeforce has held an event in Colorado and the main event featured a rematch between Duane Ludwig and Sammy Morgan.

Strikeforce: Four Men Enter, One Man Survives was a mixed martial arts event held at the HP Pavilion in San Jose, California on November 16, 2007. The event was hosted by Strikeforce in conjunction with bodogFight, and was streamed live on Yahoo! Sports. The event held two distinctions in that: 1) it contained the first MMA tournament sanctioned by the California State Athletic Commission and 2) Strikeforce's heavyweight champion was determined during the event in a non-tournament fight.