Galaxy began his professional boxing career in 1980. He defeated Eusebio Espinal of the Dominican Republic for the World Boxing Association (WBA) junior bantamweight (also known as super flyweight) championship on Nov. 21, 1984, knocking out his opponent in the sixth round. Galaxy retired after his 19th title defense, a 12-round decision (a fight whose outcome is determined by judges' scoring) over Armando Castro of Mexico on Dec. 21, 1991. Galaxy won 49 of his 50 matches, including 43 by knockout, losing only to Sakda Saksuree of Thailand in a 10-round decision on July 29, 1981 (in a rematch, he knocked out Saksuree). His twin brother, Kaokor Galaxy (Nirote Saenkham), won the WBA bantamweight (118 pounds) championship on May 9, 1988. Thereby they became the first twin brothers to hold world boxing titles. Khaosai Galaxy was inducted into the International Boxing Hall of Fame in 1999.