, 4-3.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Okayama 2004 | 5 | 25 | Oiso, Masashi (1883) | Won 2-1 | Mori, Katsuhiro (1897) |
| Grand Prix Singapore 2005 | 11 | 22 | Oiso, Masashi (2010) | Lost 1-2 | Mori, Katsuhiro (1938) |
| Grand Prix Niigata 2005 | 13 | 9 | Oiso, Masashi (2215) | Won 2-0 | Mori, Katsuhiro (2019) |
| Grand Prix Beijing 2005 | 8 | 11 | Oiso, Masashi (2196) | Lost 0-2 | Mori, Katsuhiro (2041) |
| Grand Prix Hiroshima 2006 | 14 | 3 | Oiso, Masashi (1906) | Lost 0-2 | Mori, Katsuhiro (1963) |
| Grand Prix Kitakyushu 2009 | 6 | 13 | Oiso, Masashi (1889) | Won 2-1 | Mori, Katsuhiro (1996) |
| Grand Prix Kitakyushu 2009 | Q | | Oiso, Masashi (1980) | Won 2-1 | Mori, Katsuhiro (2046) |