Yoo Joo-sang losses

Over 5 years as a professional, Yoo Joo-sang has compiled a 9-2 (5) record, fighting across three weight classes. He has two losses.

1. 2. Yoo Joo-sang loses to Michael Aswell Jr. via split decision

   On September 19, 2026 Yoo Joo-sang faced Michael Aswell Jr. in a featherweight bout. Joo-sang was 32 years old with a record of 9-1, and Jr. was 0 with a record of 0-0. Joo-sang was coming off a loss. Joo-sang lost via split decision.

2. 1. Yoo Joo-sang loses to Daniel Santos via KO

   On October 4, 2025 Yoo Joo-sang faced Daniel Santos in a featherweight bout. Joo-sang was 31 years old with a record of 9-0, and Santos was 30 with a record of 13-2. Joo-sang was on an undefeated 9-fight winning streak and Santos was on a 3-fight winning streak. Santos stopped Joo-sang via TKO in the 2nd round.