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.