WBC Bantamweight Championship

In 1985 he captured the vacant WBC Bantamweight title with a disqualification victory over Freddie Jackson in Aruba.

He lost his title in his first defense to Miguel "Happy" Lora. In his next bout in 1986, he suffered a non-title loss to IBF Bantamweight Champion and future International Boxing Hall of Fame member Jeff Fenech in Australia.

WBC Super Bantamweight Championship

Zaragoza moved up in weight in his next bout and scored 7 consecutive wins before capturing the vacant WBC Super Bantamweight title with a knockout win over future hall of fame member Carlos Zarate in 1988.

He successfully retained the title five times, including a hard-fought draw in South Korea against IBF Super Bantamweight champion Lee Seung-hoon, a knockout victory against future champion Valerio Nati in Italy, a decision victory over Paul Banke (16–3–0) in the first fight of their trilogy, a knockout victory against Frankie Duarte (47–7–1), and a decision victory over former champion Chan-Yong Park in South Korea. In 1990, he lost the belt to Paul Banke whom he had defeated just three fights prior.^[1]

Banke would go on to lose the title by knockout against Pedro Ruben Decima, who in turn was knocked out by Kiyoshi Hatanaka. In 1991, Zaragoza regained the belt with a split decision win over Hatanaka in Japan. He defended the belt against Chun Huh (25–2–0) of South Korea and avenged his loss to Paul Banke. In 1992, he lost his title to Thierry Jacob by decision in France. In his next two fights he battled newly crowned WBC super bantamweight titleholder Tracy Harris Patterson, who had recently defeated Jacob. He fought to a draw with Patterson in the first bout and lost by technical knockout in the second bout when the fight was stopped due to a cut despite the objections of Zaragoza.