Rex Tso Sing-yu (in Chinese): 曹星如; born 15 July 1987) is a Hong Kong amateur boxer and former professional boxer. He has won several regional titles at super-flyweight and has been ranked in the world top 10 by the WBO.

However, after Rex Tso leaving his mother gym and returned to amateur boxing, his winning record decreased significantly. His amateur record is now 3 wins and 11 losses.

Professional career

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.^[1]

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.^[2]

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.^[3]

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.^[4] After six rounds, Tso was unable to continue due to swelling around his eye. Nevertheless, Tso remained unbeaten by winning a technical decision.^[5]

Professional boxing record

No.	Result	Record	Opponent	Type	Round, time	Date	Location	Notes
22	Win	22–0	Kohei Kono	TD	7 (12)	Oct 7, 2017	Convention and Exhibition Centre, Wan Chai, Hong Kong	Retained WBO International super-flyweight title; Unanimous TD after Tso sustained swelling from an accidental head clash
21	Win	21–0	Hirofumi Mukai	KO	8 (12), 0:37	Mar 11, 2017	Convention and Exhibition Centre, Wan Chai, Hong Kong	Retained WBC–ABCO and WBO International super-flyweight titles; Won WBO Asia Pacific super-flyweight title
20	Win	20–0	Ryuto Maekawa	UD	10	Oct 8, 2016	Convention and Exhibition Centre, Wan Chai, Hong Kong	Retained WBC–ABCO super-flyweight title; Won vacant WBO International super-flyweight title
19	Win	19–0	Young Gil-bae	TKO	4 (12), 2:57	May 14, 2016	Convention and Exhibition Centre, Wan Chai, Hong Kong	Retained WBC–ABCO super-flyweight title; Won vacant WBO Asia Pacific super-flyweight title
18	Win	18–0	Bradley Hore	TKO	7 (10), 2:57	Aug 29, 2015	Convention and Exhibition Centre, Wan Chai, Hong Kong	Won vacant WBC–ABCO super-flyweight title
17	Win	17–0	Phum Kunmat	TKO	4 (8), 2:55	Jul 18, 2015	Cotai Arena, Macau, SAR
16	Win	16–0	Michael Enriquez	UD	10	Mar 7, 2015	Cotai Arena, Macau, SAR	Won vacant WBA International super-flyweight title
15	Win	15–0	Espinos Sabu	UD	8	Nov 23, 2014	Cotai Arena, Macau, SAR
14	Win	14–0	John Bajawa	TKO	5 (8), 0:48	Jul 19, 2014	Cotai Arena, Macau, SAR
13	Win	13–0	Nattaphong Panpaew	UD	10	May 31, 2014	Cotai Arena, Macau, SAR	Retained WBO Asia Pacific super-flyweight title
12	Win	12–0	Mako Matsuyama	TKO	8 (10), 1:27	Feb 22, 2014	Cotai Arena, Macau, SAR	Retained WBC–ABCO Continental super-flyweight title; Won vacant WBO Asia Pacific super-flyweight title
11	Win	11–0	Chaloemchai Khrithammarat	TKO	1 (6), 2:29	Nov 24, 2013	Cotai Arena, Macau, SAR
10	Win	10–0	Rusalee Samor	MD	6	Jul 27, 2013	Cotai Arena, Macau, SAR
9	Win	9–0	Wandee Singwancha	TKO	4 (12), 1:04	May 28, 2013	Convention and Exhibition Centre, Wan Chai, Hong Kong	Retained WBC–ABCO Continental super-flyweight title
8	Win	8–0	Timur Shailezov	RTD	10 (12), 3:00	Dec 11, 2012	Convention and Exhibition Centre, Wan Chai, Hong Kong	Won vacant WBC–ABCO Continental super-flyweight title
7	Win	7–0	Manot Comput	UD	4	May 5, 2012	Marina Bay Sands Hotel, Singapore
6	Win	6–0	Torsak Singabasak	TKO	1 (10), 1:55	Apr 26, 2012	Kowloonbay International Trade & Exhibition Centre, Kowloon, Hong Kong
5	Win	5–0	Aldrin Janer	TKO	4 (4), 0:34	Feb 19, 2012	Balibago Gym, Santa Rosa, Philippines
4	Win	4–0	Mabert Paulino	UD	4	Jan 28, 2012	Recom Dome, Caloocan, Philippines
3	Win	3–0	Jeffrey Pajaroja	TKO	2 (4), 1:52	Dec 14, 2011	Brusmick Compound Gym, Santa Rosa, Philippines
2	Win	2–0	Unknown	KO	1 (4), 1:09	Oct 25, 2011	Yiliang, People's Republic of China
1	Win	1–0	Xian Qian Wei	UD	4	Sep 12, 2011	Kowloonbay International Trade & Exhibition Centre, Kowloon, Hong Kong	Professional debut