June 28th 1985-Kudok Gymnasium, Busan, South Korea
Ji Won Kim (13-0-2, 4) vs Bobby Berna (26-4-1, 14)
Over the last few years we have seen several world champions retire unbeaten, such as Floyd Mayweather Jr, Joe Calzaghe and Sven Ottke, in the past however the achievement was much rarer and one of the first to achieve such a feat was Korean Ji Won Kim [김지원] who fought in the 1980's. One of his final bouts was against Filipino Bobby Berna.
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