Herschel Walker was victorious in his mixed martial arts debut for Strikeforce on Saturday night. Walker, 47, defeated newcomer Greg Nagy (1-2) when the referee stopped the fight at 2:17 of the third round. The former NCAA and NFL star is a fifth-degree black belt with training in Tae Kwon Do, Kenpo karate and Muay Thai. Following the fight, Walker did not rule out fighting again.