[3] Olivo built a record of 15–0 (3 KOs), fighting in places like the Forum, the Silver Slipper in Las Vegas, Nevada, and the Los Angeles Sports Arena when he met the 2–0 coming in, future WBC flyweight champion Eleoncio Mercedes of the Dominican Republic at the Olympic Auditorium in Los Angeles as the headliner fight of a show promoted by Aileen Eaton.
Ursua had 21 wins and 4 losses when the two fought on February 9, 1980 at the Olympic Auditorium on the undercard of an event headlined by Lupe Pintor's WBC bantamweight title defense against Alberto Sandoval in another show promoted by Aileen Eaton.
[10] Olivo then lost to local prospect Reynaldo Jose Becerra by unanimous decision over ten rounds on June 15, at Caracas, Venezuela, before visiting Mexico, where he split his next two bouts beating 28–4 Candido Tellez on October 23 but then losing to future world champion German Torres, 33–5–1, via ten-round points decision on January 23, 1982, at the Arena Coliseo in Mexico City.
Olivo became the WBA light flyweight champion when he beat Quiroz by a close but unanimous fifteen-round decision with scores of 145–143, 144–143 and 143–142, all in favor of the Californian.
[17] A return trip to South Korea meant losing his world title for Olivo, as he went back to the Asian country late in 1985 to defend the title against future International Boxing Hall of Fame member Myung Woo Yuh, who was 18–0 (4 KOs) coming into their December 8 meeting at the Municipal Stadium in Daegu.
[18] Now near the end of his professional boxing career, Olivo pulled victories over Eyüp Can and future WBO super flyweight champion Jose Quirino before winning the vacant WBC-NABF flyweight title against 10–3–1 Fernando Varguez by twelve-round unanimous decision on June 16, 1988 at the Great Western Forum in Los Angeles.
[19] The win against Varguez was the last career win for Olivo, who next lost the WBC-NABF flyweight title in his first defense, to Mexico's former world title challenger Javier Lucas by a first-round knockout on October 3 in Tijuana and then lost one more fight before facing future IBF super flyweight champion Robert Quiroga, losing that fight, which was for the vacant WBC Continental Americas super flyweight title, by twelve-round unanimous decision on July 7, 1989 at the Sunken Gardens in San Antonio, Texas.