Keisuke Yamada (山田 圭介, Yamada Keisuke, born July 6, 1974) is a Japanese professional wrestler, better known by the ring name Black Buffalo (ブラックバファロー, Burakku Bafarō). Originally starting his career in International Wrestling Association of Japan, where he worked under his real name, Yamada found a new home promotion in 1999 in Osaka Pro Wrestling, where he began wrestling under a mask and the ring name Black Buffalo. For most of his career in Osaka Pro, Yamada has portrayed a villainous character, having been a part of every major villainous alliance in the history of the promotion. During his first years in the promotion, Buffalo went on to become a four-time Tag Team Champion. In February 2008, Buffalo was forced to unmask and reveal his true identity, after losing a match, and afterwar