event | round | table | player one | result | player two |
Grand Prix Yokohama 2003 | 5 | 139 | Ootsuka, Koutarou (1555) | Lost 1-2 | Yamamoto, Akimasa (1608) |
Grand Prix Shizuoka 2008 | 5 | 35 | Ootsuka, Koutarou (2029) | Lost 0-2 | Yamamoto, Akimasa (1696) |
Grand Prix Hiroshima 2011 | 9 | 8 | Ootsuka, Koutarou (1782) | Lost 0-2 | Yamamoto, Akimasa (1811) |