Rex Tso Sing-yu : æ¹æÂÂå¦Â; born 15 July 1987) is a Hong Kong professional boxer. He has won several regional titles at super-flyweight and has been ranked in the world top 10 by the WBO.
Tso won the WBC Asia Continental Super Flyweight title in December 2012 in a bruising 12-round contest against Timur Shailezov of Kyrgyzstan, stopping his opponent in the 10th round.
He then captured the WBO Asia-Pacific Junior Bantamweight title against Mako Matsuyama in February 2014, winning by TKO in the 8th round of the 10-round contest.
Tso then added the WBA International Super Flyweight title to his collection after defeating Michael Enriquez in March 2015.
On May 14, 2016, Tso faced Young Gil-bae. Tso made easy work out of the South Korean veteran, dominating the whole fight before stopping him in the fourth round.
He then captured the WBC Asia Super Flyweight title against Brad Hore in August 2015 and the WBO International Junior Bantamweight title against Ryuto Maekawa in October 2016.
On March 11, 2017, he successfully defended his WBO International and WBC Asian Boxing Council titles and claimed the WBO Asia-Pacific title against Hirofumi Mukai. Tso battered Mukai and dropped him twice before finishing him with a left to the body in the 8th round. With the win, Tso improved his record to 21-0.
In October 2017, Tso faced former WBA world champion Kohei Kono. Tso had sought to fight Kono while the latter a world champion, but was unable to draw him into the ring. After six rounds, Tso was unable to continue due to swelling around his eye. Nevertheless, Tso remained unbeaten by winning a technical decision.
October 26, 2025, In an early boxing event dedicated as the 50th Year Anniversary of the historic Thrilla in Manila between Muhammad Ali and Joe Frazier. Co-featured bout, Rex Tso will face India's Sagar Chouhan for the ten-round bout in what will be Tso's second fight since ending an eight-year sabbatical from the pro ranks earlier this year at the San Andres Sports Complex in Manila.