Isaac Lucero losses
Over 6 years as a professional, Isaac Lucero has compiled a 18-1 (14) record, including four title fights across two weight classes. His only loss came in a title fight against Ismael Flores.
1. Isaac Lucero loses to Ismael Flores via unanimous decision
On May 2, 2026 Isaac Lucero fought Ismael Flores for the vacant WBO NABO super welterweight title. Lucero was 27 years old with a record of 18-0, and Flores was 0 with a record of 0-0. Lucero was on an undefeated 18-fight winning streak. Lucero lost via unanimous decision. Failed to win the vacant title. Went the distance with Flores.