Roger Gracie

World Heavyweight Champion Alistair "The Demolition Man" Overeem (32-11) will make his highly anticipated return to action against heavy-handed knockout artist Brett "The Grim" Rogers (10-1) in the main event of a STRIKEFORCE mixed martial arts (MMA) extravaganza at Scottrade Center in St. Louis, Mo., on Saturday, May 15. In another heavyweight confrontation, Andrei "The Pitbull" Arlovski (15-7) will clash with Antonio "Big Foot" Silva (13-2).

Strikeforce World Grand Prix Semi-Finals: Barnett vs. Kharitonov was a mixed martial arts event held by Strikeforce that served as the Heavyweight Tournament semifinals. The event took place on September 10, 2011 at U.S. Bank Arena in Cincinnati, Ohio.

Strikeforce: Diaz vs. Cyborg, was a mixed martial arts event that was held by Strikeforce on January 29, 2011 at the HP Pavilion in San Jose, California, United States.

Strikeforce: Rockhold vs. Kennedy was a mixed martial arts event held by Strikeforce. The event took place on July 14, 2012 at the Rose Garden in Portland, Oregon, Oregon.

UFC 162: Silva vs Weidman was a mixed martial arts event on July 6, 2013 at the MGM Grand Garden Arena in Las Vegas, Nevada.

Strikeforce: Marquardt vs. Saffiedine was a mixed martial arts event held by Strikeforce. The event took place on January 12, 2013 at the Chesapeake Energy Arena in Oklahoma City, Oklahoma. This was the final event for Strikeforce before the organization is folded and merged with the UFC.