Starting off his pro career on May 2013 age 25, Oscar Negrete has had a total of 18 fights - 17 wins, 1 losses, and 0 draws. 7 of the wins coming via stoppage. He started his best winning streak on May 2013 however, this came to an end on June 2017. In this period he won a total of 17 fights.
In an impressive debut, Negrete kept his calm and defeated Cristian Ciciliano over 4 rounds via a judges decision. This was only the 3rd time Ciciliano had been taken the full distance. Following his debut, Negrete had an impressive start to his career as he went on to win his next 9 fights including 3 times in 2013 and 2 times in 2015 fighting the likes of as Ramon Barboza, Jesus Domenech and Luis Maldonado.
Negrete then went on to fight and beat Jesus Domenech on August 10th, 2013 maintaining his unbeaten record. Showing his class against Domenech, Negrete was the 2nd person to go the distance with this opponent. Negrete then went on to win again against Pablo Cupul setting him up well for his next pro fight.
Negrete then went on to fight and beat Carlos Medina on July 9th, 2014 maintaining his unbeaten record. Carlos Medina was Negrete's next opponent of his career in 2014. The fight was scheduled for 4 and Negrete was the 2nd person to go the distance with Medina. Fights against Ramiro Robles, Jose Estrella, Luis Maldonado and 4 others followed where he won all 7 fights taking his winning streak to 12 wins.
Neftali Campos was beaten next on March 4th, 2016 meaning Negrete could maintain his unbeaten streak. Neftali Campos was Negrete's next opponent of his career in 2016. The fight was scheduled for 8 and Negrete was the 3rd person to go the distance with Campos. 3 wins followed for Negrete including being the 8th person to stop Raul Hidalgo (Round 4 KO), 6th person to beat Victor Ruiz and 7th person to beat Jose Bustos.
Next was Sergio Frias on June 30th, 2017 where Negrete took the win continuing his unbeaten streak. The 10 round fight ended in the 8th round via RTD crowning Negrete as only the 4th to stop Frias.
Oscar Negrete was defeated by Rey Vargas on December 2nd, 2017 in his next fight. A confident Negrete came against his biggest challenge to date on December 2nd, 2017, being out-boxed in a 12 round UD loss to Vargas on the judges decision. This was Negrete's first defeat as a pro.