 Co first played in the PBA on April 22, 1975, scoring 34 points and leading Crispa to a 113-102 win over CFC, the team's first victory after starting the season with three (3) straight defeats.During his PBA stint, he played for the two-time grand slam champion Crispa Redmanizers from 1975 to 1984, with him as one of the team's top scorers.In 1976, he received the All-Filipino Sports Award for Basketball.