Despite his record, Pimentel was denied a chance at the bantamweight title until he was past his prime. His last professional fight was an unsuccessful attempt to wrest the crown from all-time great bantamweight champion Rubén Olivares on December 14, 1971. Despite a valiant effort, Olivares stopped Pimentel on an eleventh round TKO.
- He was selected to The Ring's list of 100 greatest punchers of all time.
- He was inducted into the World Boxing Hall of Fame.