Mellow Man Ace (born Ulpiano Sergio Reyes in 1967) is an Afro-Cuban rapper.

Born in Pinar del Rio, Cuba, and raised in South Gate, California Mellow Man is best known for the song "Mentirosa" ("Liar" in Spanish). The song took a riff from Carlos Santana's "Evil Ways" as the music, repeated and tweaked to fit the lyrics, which were sung in Spanglish (mixing English and Spanish). "Mentirosa" was the first Spanglish hit record.

Mellow now is 1/2 of alternative hip hop group The ZZYZZX with his son Cazal Organism. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.