Muñoz was born on United States Fleet Activities Yokosuka, a United States Navy base in Yokosuka, Japan, to Filipino parents. At the age of two, Muñoz and his family relocated to Vallejo, California. Muñoz began wrestling at the age of 13 and also played football, but had to give up the latter sport when he was a sophomore in high school due to an injury. Because of his size and raw talent, Muñoz began wrestling with the varsity team at Vallejo High School. At Vallejo, Muñoz went on to be a two-time State Champion, an Asics First Team All-American, a 1995 National High School Champion, and the 1996 NHSCA National High School Champion. Muñoz was also on the honor roll for all four years and a member of the National Honors Society. That same year, Muñoz won a silver medal for the USA Junior National Team and finished fifth in his weight class at the FILA Junior World Wrestling Championship. Muñoz went on to compete at Oklahoma State University, where he compiled 121 wins overall, was a two-time All-American, and won an NCAA National Championship in 2001 as a senior. Muñoz was also a three-year member of the FILA Junior World Wrestling Team, earning the silver medal in 1998. Muñoz received a Bachelor of Science degree in Health Science from Oklahoma State University, and was also a three-time member of the NWCA All-Academic Team. After finishing college, Muñoz came back to be an assistant coach at Oklahoma State for two years, leading the team to an NCAA National Championship in 2003. Muñoz then began coaching at UC Davis, before transitioning into a career in mixed martial arts.
Muñoz made his WEC debut at WEC 34 on June 1, 2008 in the Arco Arena in Sacramento, California. Muñoz defeated Chuck Grigsby via KO (punches) at 4:15 of the first round.
Muñoz was slated to fight Steve Steinbeiss at WEC 36 on November 5, 2008, but due to an undisclosed reason he was replaced by TUF alum Alex Schoenauer.

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