Yoshihiro Akiyama (秋山 成勲 Akiyama Yoshihiro)(born July 29, 1975), also known as Choo Sung-hoon (Hangul: 추성훈, Hanja: 秋成勳) is a South Korean-Japanese mixed martial artist and judoka. Akiyama won the gold medal at the 2001 Asian Championships for South Korea, and for Japan at the 2002 Asian Games. A fourth-generation Japanese of Korean descent, he acquired Japanese nationality in 2001.
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