| Douki | |
|---|---|
| Birth name | Tatsuya Hayama |
| Born | December 24, 1991[1] Yokohama, Kanagawa, Japan[1] |
| Professional wrestling career | |
| Ring name(s) | Douki Dowki Kansuke Tetsuya Tatsuya |
| Billed height | 1.70 m (5 ft 7 in)[1] |
| Billed weight | 85 kg (187 lb)[1] |
| Billed from | Yokohama, Japan |
| Trained by | Skayde Último Dragón Arturo Beristain |
| Debut | November 2010 |
Tatsuya Hayama (葉山 達也, Hayama Tatsuya, born December 24, 1991), better known by his ring name Douki (stylised in all caps as DOUKI), is a Japanese professional wrestler signed to New Japan Pro-Wrestling (NJPW), where he is a member of the Just 5 Guys stable and the current IWGP Junior Heavyweight Champion in his first reign. Douki was a part of the Suzuki-gun stable from 2019 till the faction's disbandment in 2022.