He successfully defended his title four times, which included wins over future champion Valerio Nati, Paul Banke (16-3-0), Frankie Duarte (47-7-1), and former champion Chan-Yong Park.
Decima turned pro in 1984 and captured the WBC super bantamweight title with an upset TKO win over Paul Banke in 1990, a fight in which Banke was knocked down three times in the 4th round.
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