34. Ruben Olivares
Divisions: Bantamweight (118), Featherweight (126)
Years Active: 1965-1988
An immensely popular and successful Mexican boxer, during his career, he held the WBC and WBA versions of both the bantamweight and featherweight world championships during his career. Ranked the 12th greatest puncher of all time by Ring Magazine, an astounding 87.5 percent of his wins came by knockout.
He began his career with 22 straight KO wins. Soon thereafter, and still undefeated (26-0-1), he embarked on a 29-fight streak that saw him win every fight by KO or opponent’s disqualification and landed two bantamweight titles in the process.
Then his golden years began, and he fought against top-flight opposition for the remainder of his career until his retirement at age 41. He would win fights against Jesus “Chucho” Castillo, Bobby Chacon and Jose Luis Ramirez.
As the years wore on, he continued to win against quality guys but started to lose with more frequency. He retired in 1988, beloved by his countrymen, and was considered Mexico’s undisputed greatest fighter of all time before Julio Cesar Chavez arrived on the scene.
(source: bleacherreport.com by Dave Carlson)