On September 10, 2005, a 24-year-old Brian Viloria (17-0, 11 KOs) got a shot at the WBC light-flyweight title held by Eric Ortiz.
Viloria came in to the fight on a 17-fight win streak with a 64% KO rate, and was fighting after a gap of 3 months and 13 days.
Brian Viloria made quick work of Eric Ortiz, stopping the champion via KO in the 1st. Viloria improves his record to 18-0 (12 KOs)
On May 13, 2012, Brian Viloria and Omar Niño Romero met again in a rematch.
Viloria came in to the fight on a 4-fight win streak with a 51% KO rate, and was fighting after a gap of 5 months and 3 days.
In the rematch, Brian Viloria stopped Omar Niño Romero via TKO in the 9th round of the 12-round world-title fight, and successfully defended his WBO flyweight title. Viloria improves his record to 31-3 (18 KOs)
On December 10, 2011, the 31-year-old WBO flyweight world champion, Brian Viloria (29-3, 16 KOs), faced Giovani Segura, in a title defense fight.
Viloria came in to the fight on a 3-fight win streak with a 50% KO rate, and was fighting after a gap of 4 months and 24 days.
Brian Viloria stopped Giovani Segura via TKO in the 8th round of the 12-round world-title fight, and successfully defended his WBO flyweight title. Viloria improves his record to 30-3 (17 KOs)
On November 17, 2012, the 31-year-old WBO flyweight champion, Brian Viloria (31-3, 18 KOs), and WBA (Unified) flyweight champion Hernán Márquez met in a title-unification fight.
Viloria came in to the fight on a 5-fight win streak with a 52% KO rate, and was fighting after a gap of 6 months and 4 days.
Brian Viloria stopped Hernán Márquez via TKO in the 10th round of the 12-round world-title fight and unified the WBO and WBA (Unified) flyweight titles. Viloria improves his record to 32-3 (19 KOs)
On April 19, 2009, a 28-year-old Brian Viloria (24-2, 14 KOs) got a shot at the IBF light-flyweight title held by Ulises Solís.
Viloria came in to the fight on a 5-fight win streak with a 53% KO rate, and was fighting after a gap of 4 months and 7 days.
Brian Viloria stopped the champion via KO in the 11th round of the 12-round world-title fight, and is crowned the new IBF light-flyweight champion. Viloria improves his record to 25-2 (15 KOs)
On July 16, 2011, a 30-year-old Brian Viloria (28-3, 16 KOs) got a shot at the WBO flyweight title held by Julio César Miranda.
Viloria came in to the fight on a 2-fight win streak with a 51% KO rate, and was fighting after a gap of 8 months and 11 days.
Brian Viloria defeated Julio César Miranda via unanimous decision and wins the WBO title. Viloria improves his record to 29-3
On February 18, 2006, the 25-year-old WBC light-flyweight world champion, Brian Viloria (18-0, 12 KOs), faced José Antonio Aguirre, in a title defense fight.
Viloria came in to the fight on a 18-fight win streak with a 66% KO rate, and was fighting after a gap of 5 months and 8 days.
Brian Viloria defeated José Antonio Aguirre via unanimous decision and successfully defended his WBC light-flyweight title. Viloria improves his record to 19-0
On August 29, 2009, the 28-year-old IBF light-flyweight world champion, Brian Viloria (25-2, 15 KOs), faced Jesus Iribe, in a title defense fight.
Viloria came in to the fight on a 6-fight win streak with a 55% KO rate, and was fighting after a gap of 4 months and 10 days.
Brian Viloria defeated Jesus Iribe via unanimous decision and successfully defended his IBF light-flyweight title. Viloria improves his record to 26-2
On September 9, 2017, a 36-year-old Brian Viloria (37-5, 22 KOs) and Miguel Cartagena met in the ring.
Viloria came in to the fight on a 1-fight win streak with a 52% KO rate, and was fighting after a gap of 6 months and 7 days.
Brian Viloria stopped Miguel Cartagena via KO in the 5th round. Viloria improves his record to 38-5 (23 KOs)
On July 19, 2014, a 33-year-old Brian Viloria (33-4, 19 KOs) and José Alfredo Zúñiga met in the ring.
Viloria came in to the fight on a 1-fight win streak with a 51% KO rate, and was fighting after a gap of 3 months and 20 days.
Brian Viloria stopped José Alfredo Zúñiga via KO in the 5th round. Viloria improves his record to 34-4 (20 KOs)