He represented his native country of the Philippines at the 1992 Summer Olympics in Barcelona, Spain, where he won the bronze medal. In the semi-finals he was stopped by Cuba's eventual winner Rogelio Marcelo. He is the elder brother of Mansueto Velasco, who won the silver medal at the 1996 Summer Olympics in the same weight division. Roel won the silver medal at the 1997 World Amateur Boxing Championships.