Judo Before competing in MMA, Yoon was a well-known
judoka with over 50 international
judo competitions under his belt and had a winning streak of 47 straight victories without conceding a single
koka, with notable wins over World champions and Olympic gold-medalists such as
Makoto Takimoto,
Mark Huizinga,
Jeon Ki-Young and
Toshihiko Koga. Despite his impressive
résumé, Yoon never competed in the Olympics; hence he was given a nickname
Judo King Without a Crown. • 1992 World Youth Championships -
2nd place • 1992 Italian Open -
gold medal • 1993 Asian Championships -
3rd place • 1993 German Open -
gold medal • 1993 Paris Open -
2nd place • 1993 Austrian Open -
gold medal • 1994 Austrian Open -
gold medal • 1994 Paris Open -
gold medal • 1994
Goodwill Games -
gold medal • 1994
Asian Games in Hiroshima -
gold medal • 1995 Paris Open -
gold medal • 1996 German Open -
gold medal • 1998 British Open -
gold medal • 1999 Iranian Open -
gold medal • 2000 Asian Championships -
gold medal • 2001 East Asian Games -
gold medal • 2001 World Championships -
3rd place Mixed martial arts (2005–present) Yoon made his
MMA debut at
PRIDE Total Elimination 2005 against legendary
Japanese fighter
Kazushi Sakuraba. It was a heavily anticipated matchup in both
Japan and
Korea due to the rivalry between the two nations and it was Sakuraba's comeback match after a ten month absence due to injuries. With a lack of MMA experience and knowledge, Yoon lost to Sakuraba only 38 seconds into the match. After the match, Yoon accepted the offer to join Sakuraba's
Takada Dojo. Yoon tasted his first victory in MMA at the
K-1 Dynamite!! USA event, where he scored a surprising submission win over heavily favored
Dutch kickboxer
Melvin Manhoef. Yoon went on to win his second consecutive fight at HERO'S by beating former
Cage Rage champion
Zelg Galesic by
armbar after only 1 minute 29 seconds. On October 28, 2007, Yoon also beat
Fábio Silva by
armbar submission making that his third win in
K-1 Hero's, his third victory in MMA, and his third consecutive win by
armbar. His newfound propensity for finishing opponents with an
armbar has led to fans and journalists dubbing the move the "Dongbar" when performed by Yoon. He was scheduled to face
Paulo Filho on October 25, 2009, at
DREAM.12, however Filho withdrew at the last minute for unknown reasons. Yoon then faced last minute replacement
Tarec Saffiedine and won via split decision. == Mixed martial arts record ==