On February 24, 2018, 37-year-old Brian Viloria (38-5, 23 KOs) and 30-year-old Artem Dalakian (15-0, 11 KOs) fought for the vacant WBA flyweight title.
Viloria came in to the fight on a 2-fight win streak with a 53% KO rate, and was fighting after a gap of 5 months and 15 days. Dalakian was on a 15-fight win streak with a 73% KO rate, and fighting after a layoff of 10 months and 2 days.
Artem Dalakian defeated Brian Viloria via unanimous decision . Dalakian improves his record to 16-0, while Viloria adds a loss to his record at 38-6.
On October 17, 2015, a 34-year-old Brian Viloria (36-4, 22 KOs) got a shot at the flyweight WBC and The Ring title held by 28-year-old Nicaraguan boxer Román González (43-0, 37 KOs).
Viloria came in to the fight on a 4-fight win streak with a 55% KO rate, and was fighting after a gap of 2 months and 22 days. González was on a 43-fight win streak with a 86% KO rate, and fighting after a layoff of 5 months and 1 day.
Román González stopped Brian Viloria via TKO in the 9th round of the 12-round world-title fight, and successfully defended his WBC and The Ring flyweight titles. González improves his record to 44-0 (38 KOs), while Viloria adds a loss to his record at 36-5.
On April 6, 2013, the 32-year-old WBA (Unified) and WBO flyweight world champion, Brian Viloria (32-3, 19 KOs), faced a 22-year-old Mexican boxer Juan Francisco Estrada (26-2, 20 KOs), in a title defense fight.
Viloria came in to the fight on a 6-fight win streak with a 54% KO rate, and was fighting after a gap of 4 months and 20 days. Estrada was on a -1-fight win streak with a 71% KO rate, and fighting after a layoff of 4 months and 20 days.
Juan Francisco Estrada defeated Brian Viloria via split decision and wins the WBA (Unified) and WBO titles — in his first world-title fight. Estrada improves his record to 27-2, while Viloria adds a loss to his record at 32-4.
On January 23, 2010, the 29-year-old IBF light-flyweight world champion, Brian Viloria (26-2, 15 KOs), faced Carlos Tamara, in a title defense fight.
Viloria came in to the fight on a 7-fight win streak with a 53% KO rate, and was fighting after a gap of 4 months and 25 days.
Brian Viloria was defending his light-flyweight IBF titles against Carlos Tamara and lost via TKO in the 12th round, and adds an loss to his record at 26-3.
On April 14, 2007, 26-year-old Brian Viloria (19-1, 12 KOs) and 27-year-old Édgar Sosa (26-5, 14 KOs) fought for the vacant WBC light-flyweight title.
Viloria came in to the fight on a 1-fight losing streak with a 60% KO rate, and was fighting after a gap of 4 months and 27 days. Sosa was on a 14-fight win streak with a 45% KO rate, and fighting after a layoff of 7 months and 12 days.
Édgar Sosa defeated Brian Viloria via majority decision . Sosa improves his record to 27-5, while Viloria adds a loss to his record at 19-2.
On August 10, 2006, the 25-year-old WBC light-flyweight world champion, Brian Viloria (19-0, 12 KOs), faced Omar Niño Romero, in a title defense fight.
Viloria came in to the fight on a 19-fight win streak with a 63% KO rate, and was fighting after a gap of 5 months and 23 days.
Brian Viloria was defending his light-flyweight WBC titles against Omar Niño Romero and lost via unanimous decision in the 12-round light-flyweight fight, and adds an loss to his record at 19-1.