Strikeforce: Shamrock vs. Gracie was the inaugural mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on March 10, 2006. The main event was the long awaited match between Frank Shamrock, returning to the sport after a 3-year absence, and Cesar Gracie. The show is also notable for featuring the MMA debut of Cung Le. This was the first Strikeforce event.

Strikeforce: Tank vs. Buentello was a mixed martial arts event held on October 7 2006. The event was held by Strikeforce and took place at the Save Mart Center in Fresno, California. This event featured the debut of future UFC Heavyweight Champion Cain Velasquez.