Koutarou Ootsuka trails the series against
Yuta Takahashi, 1-4.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Kitakyushu 2005 | 5 | 20 | Ootsuka, Koutarou (1786) | Lost 0-2 | Takahashi, Yuta (1733) |
| 2007 World Championship | 4 | 30 | Ootsuka, Koutarou (1971) | Won 2-1 | Takahashi, Yuta (1826) |
| Grand Prix Shizuoka 2008 | 11 | 55 | Ootsuka, Koutarou (2022) | Lost 1-2 | Takahashi, Yuta (1969) |
| Grand Prix Singapore 2009 | 12 | 5 | Ootsuka, Koutarou (2052) | Lost 1-2 | Takahashi, Yuta (1915) |
| Pro Tour Austin 2009 | 2 | 16 | Ootsuka, Koutarou (2146) | Lost 1-2 | Takahashi, Yuta (1937) |