[1] He competed in the 2004 Summer Olympics where he won the bronze medal and defeated then world champion Craig Fallon.

[2] He also competed in the 2008 Summer Olympics, where he won the gold medal in the 60 kg extra-lightweight category.

[3][4] In Beijing, he ended all 5 of his matches by Ippon and defeated former European champion Ludwig Paischer in the final for the gold medal.

Choi was voted as the 2008 Best Judoka of the Year by L´Esprit du Judo magazine of France.

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