Winner of his last eight fights, Strikeforce welterweight champion Nick Diaz headlines a two-title Strikeforce card on Jan. 29, 2011, in San Jose, Calif.
Diaz, coming off his dominating win over K.J. Noons, defends his title against Evangelista Cyborg in a matchup of two of the promotion's top strikers.
Middleweight champion Jacare Souza makes his first title defense against Robbie Lawler, who is fresh off a devastating knockout of Matt Lindland earlier this month.
Herschel Walker, who had to postpone his Dec. 4 fight because of a cut under his eye, will return to the cage for his second pro MMA fight. He'll fight his original opponent, Scott Carson. Roger Gracie will fight Trevor Prangley on the Showtime card, as well.