William Abreu is a former folkstyle, freestyle, and Greco-Roman wrestler, who is also a jiu-jitsu black belt under Roberto "Cyborg" Abreu, as well as the head grappling coach of the Black House Academy in Miami Beach, Florida. Abreu made a name for himself in wrestling during his high school career, later turning his attention towards BJJ where he earned important titles from the International Brazilian Jiu-Jitsu Federation (IBJJF) circuit, particularly in no-gi BJJ.