Ulpiano Sergio Reyes (born April 12, 1967), better known as Mellow Man Ace, is a Cuban-American rapper known for bilingual delivery and novelty rhymes.

[1] A Cuban rapper born in Cuba, Mellow Man Ace focused on lovers rap with a blend of urban hip hop and occasional bilingual delivery, and a heady gift for novelty rhymes.

His debut album Escape from Havana was released on Capitol on August 29, 1989, and featured production from the Dust Brothers and Def Jef.

[1] It was his only hit single, peaking at Number 14 on Billboard's Hot 100 Chart, with Ace rapping over a crafty hook from the Santana songs "No One to Depend On" and "Evil Ways".

In 2006, he collaborated with his brother Sen Dog of hip-hop group Cypress Hill,[1] culminating in the album release Ghetto Therapy.