Here is a list of Collazo's best fights.
On July 16, 2022 Oscar Collazo faced off against Vic Saludar at age 25. He was coming in with a record of 5-0 (3), and Saludar was 31 years old and with a record of 21-5 (11). Collazo won the fight via 12-round unanimous decision.
On November 16, 2024 Oscar Collazo fought Thammanoon Niyomtrong in a strawweight world-title fight for Niyomtrong's WBA and The Ring titles. Collazo was 27 years old and with a record of 11-0 (8), and Niyomtrong was 34 years old and with a record of 25-0 (9). Collazo stopped Thammanoon Niyomtrong via 7th-round TKO and is crowned the new strawweight world champion.
On May 27, 2023 Oscar Collazo fought Melvin Jerusalem in a strawweight world-title fight for Jerusalem's WBO title. Collazo was 26 years old and with a record of 7-0 (5), and Jerusalem was 29 years old and with a record of 20-2 (12). Collazo stopped Melvin Jerusalem via 7th-round retirement and is crowned the new strawweight world champion.
On March 29, 2025 Oscar Collazo met Edwin Cano Hernandez in a strawweight (WBO, WBA and The Ring) world-title defense fight. Collazo was 28 years old and with a record of 12-0 (9), and Hernandez was 27 years old and with a record of 13-2-1 (4). Collazo stopped Edwin Cano Hernandez via 5th-round KO and successfully defended his titles.
