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Brian Viloria had a total of six losses in his professional boxing career — all of them in title bouts. He suffered his first loss against Omar Niño Romero via 12 round unanimous decision on August 10, 2006, which ended his 19-fight win streak. He has been stopped two times and lost four times via decision.
Artem Dalakian, Román González, Juan Francisco Estrada, Carlos Tamara, and Édgar Sosa are some of the boxers who have beaten Viloria.
This is the first loss in Brian Viloria's career. Viloria lost to Omar Niño Romero via 12 round unanimous decision on . He was defending his light-flyweight WBC title, he was 25 years old with a record of 19-0.
On Viloria lost to Mexican boxer Édgar Sosa via 12 round majority decision. He and Sosa were fighting for the vacant light-flyweight WBC title. He was 26 years old with a record of 19-1. Sosa was 27 years old with a record of 26-5.
On Viloria lost to Carlos Tamara via 12th round TKO. He was defending his light-flyweight IBF title, he was 29 years old with a record of 26-2.
On Viloria lost to Mexican boxer Juan Francisco Estrada via 12 round split decision. He was defending his flyweight WBA (Unified) and WBO titles, he was 32 years old with a record of 32-3. Estrada was 22 years old with a record of 26-2.
On Viloria lost to Nicaraguan boxer Román González via 9th round TKO. He was fighting for González' flyweight WBC and The Ring titles, he was 34 years old with a record of 36-4. González was 28 years old with a record of 43-0.
On Viloria lost to Ukrainian boxer Artem Dalakian via 12 round unanimous decision. He and Dalakian were fighting for the vacant flyweight WBA title. He was 37 years old with a record of 38-5. Dalakian was 30 years old with a record of 15-0.