A former 6'5" standout of the UP Fighting Maroons, Juinio don the national colors in the 1993 Southeast Asian Games. He was drafted by Alaska as the 5th overall pick in the 1994 PBA Draft. Juinio turn out to be a revelation with his aggressive stance underneath the boards. He became an unheralded part of Alaska's starting unit when the team captured the PBA Grandslam in 1996. He was awarded as the Most Improved Player of the Season and has certainly blossomed into one of the most dependable slotman in the league.