 Once Guymon noticed that to become successful in MMA he would need to start developing a ground game, he started taking classes on Brazilian jiu-jitsu and wrestling.In 1999, Guymon had his first professional fight against Zach Turnage with the fight resulting in a draw after fighting in three five-minute rounds and a five-minute overtime.He won two straight before opening the eyes of the matchmaker for the King of the Cage promotion who offered him a fight against up and comer, Diego Sanchez.