José Sanmartin has six losses against six opponents on his boxing record. For a list of Sanmartin's best fights, refer to "Best fights of José Sanmartin".
On October 22, 2022 José Sanmartin faced off against Mauricio Lara in a featherweight bout at age 31. He was coming in with a record of 33-6-1 (21), and Lara was 24 years old and with a record of 24-2-1 (17). Sanmartin lost the fight via 3rd-round TKO.
On June 2, 2018 José Sanmartin faced off against Emanuel Navarrete at age 27. He was coming in with a record of 26-5-1 (17), and Navarrete was 23 years old and with a record of 24-1 (21). Sanmartin lost the fight via 12th-round KO.
On August 13, 2016 José Sanmartin faced off against Tomas Rojas at age 25. He was coming in with a record of 20-4-1 (12), and Rojas was 36 years old and with a record of 47-14-1 (32). Sanmartin lost the fight via 6-round disqualification.
On April 22, 2016 José Sanmartin faced off against Luis Melendez in a super-bantamweight bout at age 25. He was coming in with a record of 19-3-1 (11). Sanmartin lost the fight via 9-round split decision.
On August 1, 2015 José Sanmartin fought Carlos Zambrano in a featherweight world-title fight for Zambrano's WBA title. Sanmartin was 24 years old and with a record of 17-2-1 (9). Sanmartin lost the fight via 12-round unanimous decision.
On September 30, 2011 José Sanmartin faced off against Hugo Berrio at age 20. He was coming in with a record of 0-1 (0). Sanmartin lost the fight via 4-round unanimous decision.
