Villamor turned professional in 1989 along with his contemporaries were Andy Tabanas,
Gerry Peñalosa, Rey Cosep and the Alfante brothers. He held the Philippines mini flyweight champion between 1990 and 1993, with never been defeated, by defeating many skilled boxers were
Nico Thomas,
Napa Kiatwanchai,
Ronnie Magramo. During that time he was regarded as the rising star Filipino boxer who had hopes of becoming a future world champion. He had the opportunity to challenge the world champion for the first time with Thailand's
Ratanapol Sor Vorapin, the
IBF mini flyweight title holder on June 27, 1993, at
Nimibutr Stadium,
National Stadium, Bangkok, Thailand. He lost
TKO in the seventh round, Sor Vorapin retained title for the second time, Villamor suffered his first defeat. Villamor had the opportunity to challenge for world title for the second time with the
WBC strawweight champion the undefeated Mexican
Ricardo López on March 16, 1996, at
MGM Grand Garden Arena, Paradise, Nevada, U.S. As a result, he lost TKO in the early eighth round with López's left
uppercut. Villamor retired after this bout. He worked as a trainer and matchmaker of
ALA Promotions, a major boxing promotions company in the Philippines. ==Professional boxing record==