Barrios (23-0, 15 KOs) has grown into a brilliant super lightweight contender after starting out at 130 pounds. The 5-foot-10 fighter from San Antonio, Texas, has carried his power with him up the ladder as demonstrated by stopping his last seven opponents, including victories over Naim Nelson and Jose Luis Rodriguez on FS1. He enters the fight with Velasco after a knockout victory over Richard Zamora in his last fight on February 9.
Velasco (20-1, 12 KOs) picked up the nickname "The Pitbull'' early in his career because of his aggressive style. It has served the 31-year-old resident of Buenos Aires, Argentina well throughout a career in which he's only tasted defeat once. He suffered the first loss of his career in his last fight when he was stopped by Regis Prograis on July 14. He will be looking to rebound against another rising unbeaten fighter in Barrios.
The 36-year-old Korobov (28-2, 14 KOs) lost a hard-fought decision to Jermall Charlo live on FOX in a middleweight championship match on December 22. He was a late replacement and gave Charlo a tougher fight than many experts expected. Even though he came up short, the Russian-born fighter, who now lives in St. Petersburg, Florida, served notice to the rest of the division that he is still a threat to top 160-pounders.
Aleem (28-1-1, 22 KOs) will have been out of the ring for nearly a year when he steps in against Korobov. The 25-year-old is coming off a sixth-round knockout victory over Juan De Angel in his last fight on May 19. Korobov presents a major challenge for Aleem of Richmond, Virginia, who suffered the first loss of his career when he was stopped by Hugo Centeno, Jr. in August 2017 on FS1, following a career-best win over then unbeaten Ievgen Khytrov.