Juan Ramón Rivas Contreras (born March 16, 1966[1]) is a Puerto Rican retired professional basketball player, and sports color commentator.

Rivas has played in the NBA, NCAA Division I, and in the Puerto Rican National Superior League (BSN), with the Carolina Giants.

He progressed through Carolina's minor basketball tournaments, becoming one of the best centers in Puerto Rico, while he played for Levittown's Pedro Albizu Campos High School's team.

Flor Melendez took note of his progress, and signed him to play for the Carolina Giants, of Puerto Rico's top-tier level league, the BSN.

Thanks to his notable NCAA Division I college basketball career, the Boston Celtics announced that they would sign Rivas for a full season, towards the end of the 1988 Summer Olympic Games, in Seoul.

With the Celtics, Rivas had the opportunity to share playing time alongside Larry Bird, Kevin McHale, Dennis Johnson, Robert Parish, Reggie Lewis, and Brian Shaw, among others.