In January 2017 , his 2 - year contract with Top Rank was extended by 1 year .
Rex Tso is the only professional boxer from Hong Kong and only the third ethnic - Chinese boxer to be signed to Top Rank .
In January 2017 , Rex Tso 's 2 - year contract Top Rank   Rank was extended by 1 year .
Rex Tso is the only professional boxer from Hong Kong and only the third ethnic - Chinese boxer to be signed to Top Rank .