The flyweight fighter has been released from the promotion following a unanimous decision loss to Hector Sandoval on December at UFC on FOX 22, MMA Fighting recently learned. The loss to Sandoval marked the second straight loss for the Colombian, as Serrano had dropped a close split decision to Ryan Benoit at UFC 201 in July. Prior to the two-loss skid, Serrano had a promising start in the UFC with a knockout win over Bentley Syler, which earned him a Performance of the Night bonus, and a technical knockout victory over Yao Zhikui in South Korea.