Estrada made his World Wrestling Federation (WWF) debut in June 1997 as a member of Savio Vega's Los Boricuas stable with Miguel Pérez, Jr. and Jesús Castillo. They were mainly involved in angles with other stables including the Nation of Domination and the Disciples of Apocalypse (DoA).
During WrestleMania XIV's tag team battle royal, Los Boricuas engaged two teams (Savio and Miguel, and José and Jesús), fighting on Raw is War. Vega left the group in July, but the remaining members still fought as a tag team on Raw and Shotgun Saturday Night until October 1998.
Estrada was knocked out in a match with Edge, in Edge's television debut match on the June 22, 1998 episode of Raw is War.
Los Boricuas competed on Super Astros until the show ended in August 1999 and all three left the company.