camacho finished 1990 by fighting julio cesar acevedo in a rematch, this time for the vacant puerto rican light-flyweight title. acevedo had not fought since their first match and was 3-4-1 coming in. acevedo caused a mild upset by knocking camacho out in round twelve, handing camacho his first loss as a professional. this bout also took place at the pedrin zorrilla coliseum.