Joel Casamayor has six losses against six opponents on his boxing record. For a list of Casamayor's best fights, refer to "Best fights of Joel Casamayor".
On November 12, 2011 Joel Casamayor fought Timothy Bradley in a super-lightweight world-title fight for Bradley's WBO title. Casamayor was 40 years old and with a record of 38-6-1 (22), and Bradley was 28 years old and with a record of 27-0 (11). Casamayor lost the fight via 8th-round TKO.
On July 31, 2010 Joel Casamayor faced off against Robert Guerrero at age 39. He was coming in with a record of 37-5-1 (22), and Guerrero was 27 years old and with a record of 26-1-1 (18). Casamayor lost the fight via 10-round unanimous decision.
On September 13, 2008 Joel Casamayor met Juan Manuel Márquez in a lightweight (The Ring) world-title defense fight. Casamayor was 37 years old and with a record of 36-4-1 (22), and Márquez was 35 years old and with a record of 48-4-1 (35). Casamayor lost the fight via 11th-round TKO and lost the title.
On December 4, 2004 Joel Casamayor fought José Luis Castillo in a lightweight world-title fight for Castillo's WBC and The Ring titles. Casamayor was 33 years old and with a record of 31-3 (19), and Castillo was 30 years old and with a record of 50-6-1 (45). Casamayor lost the fight via 12-round split decision.
On March 6, 2004 Joel Casamayor fought Diego Corrales in a super-featherweight world-title fight for the WBO title. Casamayor was 32 years old and with a record of 30-2 (19), and Corrales was 26 years old and with a record of 37-2 (31). Casamayor lost the fight via 12-round split decision.
On January 12, 2002 Joel Casamayor, the WBA champion, met Acelino Freitas, the WBO champion, in a super-featherweight world-title unification fight. Casamayor was 30 years old and with a record of 26-1 (16), and Freitas was 26 years old and with a record of 30-0 (29). Casamayor lost the fight via 12-round unanimous decision and lost his title.
