Full name
Ruben Olivares

Birthdate
January 14, 1947

Debut
On January 4, 1965, in Cuernavaca, Morelos, he knocked out Isidro Sotelo in one round.

won the world title
On August 22, 1969, at the Forum in Inglewood, California, he knocked out Lionel Rose in the fifth round and became the World Boxing Council and World Boxing Association bantamweight champion. He returned to reign in the WBC bantamweight division on April 2, 1971 after defeating Chucho Castillo by unanimous decision, at the Forum in Inglewood, California. On July 9, 1974, in Inglewood, he knocked out Zensuke Utagawa in seven rounds to win the WBA featherweight championship. The fourth time that Olivares won a world title was on June 20, 1975, in Inglewood, when he technically knocked out Bobby Chacón in two rounds and snatched the WBC featherweight belt from him.

Lost His Title
On October 2, 1970 in his third defense, in Inglewood, Chucho Castillo technically knocked him out in 14 rounds. The WBA and WBC bantamweight title was lost in his third defense against Rafael"Huáscato"Herrera, on March 3, 1972, at the Cuatro Caminos Bullfight in Mexico City, who technically knocked him out in eight rounds. On November 23, 1974, in Inglewood, California, he lost the WBA featherweight championship against the Nicaraguan Alexis Argüello, who knocked him out in round 13. On September 20, 1975, in what was his first defense, he lost the featherweight title. of the WBC when he was defeated by unanimous decision in 15 rounds by David Kotey, in Inglewood, California

Withdrawal
On March 12, 1988, in the Mexico arena, Ignacio Madrid knocked him out in four rounds.