Chang Jung-koo

Within the recorded range there are 42 bouts between 1980 and 1991, about one every 3.2 months. 17 of the 38 wins came inside the distance. Of the 4 losses, 1 came inside the distance and 3 on the cards. The highest it has been is 2354, in 1989; it stands at 2207 now. The best win came against Hilario Zapata in 1983, who was rated 2162 at the time.

The biggest upset conceded was the loss to Muangchai Kittikasem in 1991. The rating was sliding across the final four bouts.