On February 26, 2004, the 27-year-old WBO super-bantamweight world champion, Joan Guzmán (20-0, 16 KOs), faced a 34-year-old fellow Dominican boxer Agapito Sánchez (31-9-3, 16 KOs), in a title defense fight.
Guzmán came in to the fight on a 20-fight win streak with a 80% KO rate, and was fighting after a gap of 5 months and 28 days. Sánchez was on a 0-fight win streak with a 37% KO rate, and fighting after a layoff of 2 years, 3 months, and 16 days.
Joan Guzmán stopped Agapito Sánchez via TKO in the 7th round of the 12-round world-title fight, and successfully defended his WBO super-bantamweight title. Guzmán improves his record to 21-0 (17 KOs), while Sánchez adds a loss to his record at 31-10-3.
On August 17, 2002, 26-year-old Joan Guzmán (17-0, 13 KOs) and Fabio Daniel Oliva fought for the vacant WBO super-bantamweight title.
Guzmán came in to the fight on a 17-fight win streak with a 76% KO rate, and was fighting after a gap of 5 months and 22 days.
Joan Guzmán made easy work of Fabio Daniel Oliva, stopping Oliva via KO in the 3rd. Guzmán improves his record to 18-0 (14 KOs)
On November 17, 2007, the 31-year-old WBO super-featherweight world champion, Joan Guzmán (27-0, 17 KOs), faced a 27-year-old Mexican boxer Humberto Soto (42-5-2, 27 KOs), in a title defense fight.
Guzmán came in to the fight on a 27-fight win streak with a 63% KO rate, and was fighting after a gap of 10 months and 30 days. Soto was on a 20-fight win streak with a 55% KO rate, and fighting after a layoff of 2 months and 3 days.
Joan Guzmán defeated Humberto Soto via unanimous decision and successfully defended his WBO super-featherweight title. Guzmán improves his record to 28-0, while Soto adds a loss to his record at 42-6-2.
On December 18, 2006, the 30-year-old WBO super-featherweight world champion, Joan Guzmán (26-0, 17 KOs), faced Antonio Davis, in a title defense fight.
Guzmán came in to the fight on a 26-fight win streak with a 65% KO rate, and was fighting after a gap of 3 months and 2 days.
Joan Guzmán defeated Antonio Davis via unanimous decision and successfully defended his WBO super-featherweight title. Guzmán improves his record to 27-0
On April 22, 2005, the 28-year-old WBO super-bantamweight world champion, Joan Guzmán (22-0, 17 KOs), faced Fernando Beltrán, in a title defense fight.
Guzmán came in to the fight on a 22-fight win streak with a 77% KO rate, and was fighting after a gap of 5 months and 16 days.
Joan Guzmán defeated Fernando Beltrán via unanimous decision and successfully defended his WBO super-bantamweight title. Guzmán improves his record to 23-0
On August 9, 2001, a 25-year-old Joan Guzmán (14-0, 12 KOs) and Héctor Ávila met in the ring in a super-bantamweight bout.
Guzmán came in to the fight on a 14-fight win streak with a 85% KO rate, and was fighting after a gap of 5 months and 1 day.
Joan Guzmán stopped Héctor Ávila via KO in the 2nd round. Guzmán improves his record to 15-0 (13 KOs)
On September 16, 2006, a 30-year-old Joan Guzmán (25-0, 17 KOs) got a shot at the WBO super-featherweight title held by Jorge Rodrigo Barrios.
Guzmán came in to the fight on a 25-fight win streak with a 68% KO rate, and was fighting after a gap of 4 months and 10 days.
Joan Guzmán defeated Jorge Rodrigo Barrios via split decision and wins the WBO title. Guzmán improves his record to 26-0
On November 28, 2009, 33-year-old Joan Guzmán (29-0, 17 KOs) and Ali Funeka fought for the vacant IBF lightweight title.
Guzmán came in to the fight on a 29-fight win streak with a 58% KO rate, and was fighting after a gap of 11 months and 8 days.
The fight ended in a majority decision draw and both the fighters added a draw to their respective records — Guzmán is now 29-0-1.
On February 1, 2000, a 23-year-old Joan Guzmán (9-0, 7 KOs) and Santiago Matos met in the ring in a featherweight bout.
Guzmán came in to the fight on a 9-fight win streak with a 77% KO rate, and was fighting after a gap of 3 months and 7 days.
Joan Guzmán stopped Santiago Matos via TKO in the 2nd round. Guzmán improves his record to 10-0 (8 KOs)
On December 20, 2008, a 32-year-old Joan Guzmán (28-0, 17 KOs) and Ammeth Diaz met in the ring in a lightweight bout.
Guzmán came in to the fight on a 28-fight win streak with a 60% KO rate, and was fighting after a gap of 1 year, 1 month, and 3 days.
Joan Guzmán defeated Ammeth Diaz via unanimous decision in the 12-round lightweight fight. Guzmán improves his record to 29-0