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Toshiyuki Hamaguchi in Zhuhai in 2008.

Toshiyuki Hamaguchi (kanji: 浜口俊之, born June 4, 1970) is a Japanese motorcycle racer who has won the 600cc Supersports class of the FIM Asian Grand Prix Championship six times: in 2002, 2003, 2004, 2005, 2006, and 2008.

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