WBC Super Flyweight Champion from February 1997-August 1998, and the WBO Bantamweight Champion from August 2007 to April 2009.
He had an amateur record of 27-0 before turning professional in 1989.
He is considered one of the best technical boxers from the Philippines, and was never knocked out during his career.
His older brother is world champion Dodie Boy Penalosa.
He defeated Japan's Hiroshi Kawashima via split decision to win the WBC Super Flyweight title.