1971-12-14 Ruben Olivares w rtd 11 (15) Jesus Pimentel, Inglewood Forum, Los Angeles, California, USA - WORLD
1971-12-14 Ruben Olivares w rtd 11 (15) Jesus Pimentel, Inglewood Forum, Los Angeles, California, USA - WORLD. Referee: John Thomas. On the verge of being knocked out in the fourth round, Olivares (118) came back to blast Pimentel (116½) right out of the ring in the sixth and, although the challenger got up at the count of eight, the writing was on the wall. By the end of the 11th Pimentel was in a battered and dazed state, having had to take left hooks to head and body and the occasional right to the jaw round after round, and he was pulled out by his corner to save him from taking further punishment.
Having won the vacant NABF title when beating Rodolfo Martinez (w pts 12 on 20 January at the Inglewood Forum) and successfully defending it at the same venue against Chucho Castillo (w pts 12 on 23 August), Rafael Herrera would be the next challenger for Olivares.