Biography(references)Otsuka made the move from a successful professional wrestling career to mixed martial arts competition in 1995. He earned a notable victory over Vale Tudo pioneer Marco Ruas in 1998. Though Otsuka finished his career in 2006 with a 4-13 record, he mostly faced very high-ranked opponents, including all-time greats Renzo Gracie, Ken Shamrock, Igor Vovchanchyn, Quinton Jackson, Wanderlei Silva, and Anderson Silva, all of whom defeated him.
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