WBA Light Welterweight Championship East turned professional in 1989, at the young age of 15, and won the
WBA World Light Welterweight Championship by defeating
Akinobu Hiranaka with an 11th-round TKO victory in Tokyo on 9 September 1992. With the victory, East became the youngest ever Filipino to hold a world championship in boxing at the age of 19 years and 31 days old. He is also the second youngest boxer to win a world title at 140 lbs., second to Puerto Rico's
Wilfred Benítez, who won the WBA World Jr. Welterweight title when he was 17 years old, the youngest ever to win a world title in boxing history. The victory over Hiranaka was named
Ring Magazine Knockout of the Year for 1992. Morris lost the title in his first defense against
Martín Coggi. After winning and defending the Philippines Games & Amusement Board
Light Middleweight Championship in 1995, East retired from boxing at only 21 years of age. To this day, East holds the record for the youngest retirement of a former world champion. ==Professional boxing record==