Tatsuya Hayama (葉山達也 Hayama Tatsuya, born February 24, 1991) is a Japanese professional wrestler, better known by the ring name DOUKI, where he currently works for New Japan Pro-Wrestling (NJPW) as a freelancer. He also appeared for Michinoku Pro Wrestling (MPW) and Kaientai Dojo (K-Dojo), where he was a member of Magatsuki.
He was trained by Jorge Rivera and Ultimo Dragon at Toryumon Mexico and made his debut in December 2008, working in the Mexican independent circuit most notably for Inter
