The D1 Grand Prix (D1グランプリ, D1 guranpuri), abbreviated as D1GP and subtitled Professional Drift, is a production car drifting series from Japan. After several years of hosting amateur drifting contests, Daijiro Inada, founder of Option magazine and Tokyo Auto Salon, and drifting legend, Keiichi Tsuchiya. They hosted a professional level drifting contest in 1999 and 2000 to feed on the ever increasing skills of drifting drivers who were dominating drifting contests in various parts of Japan. In October 2000, they reformed the contest as a five-round series. In the following year for the following round, the introduction of the two car tsuiou battle, run in a single-elimination tournament format, a common tradition for tōge races which became popular with car enthusiasts.