1987-12-13 Jung-Koo Chang w pts 12 Isidro Perez, Chungmu Gym, Taejon, South Korea - WBC
1987-12-13 Jung-Koo Chang w pts 12 Isidro Perez, Chungmu Gym, Taejon, South Korea - WBC. Referee: Carlos Padilla. Scorecards: 117-113, 115-113, 114-113. Knocked down in the first round, but fighting back furiously to gain a close decision over a challenger who had 35 kayos on his record, Chang (107½) once again proved he would be tough to dislodge despite having personal problems. Realising Perez (107½) was not at his best on the inside, Chang, who was cut over the left eye in the seventh, began to make up any leeway, but even then Perez came back to amaze the crowd in the last round with solid rights and good combinations.