, 4-2.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Sapporo 2002 | 12 | 31 | Oiso, Masashi (1632) | Lost 1-2 | Ishida, Itaru (1834) |
| Grand Prix Hong Kong 2004 | 10 | 28 | Oiso, Masashi (1909) | Won 2-0 | Ishida, Itaru (2035) |
| Grand Prix Kuala Lumpur 2004 | 12 | 18 | Oiso, Masashi (1975) | Lost 0-2 | Ishida, Itaru (1861) |
| Pro Tour London 2005 | 5 | 12 | Oiso, Masashi (2134) | Won 2-0 | Ishida, Itaru (1982) |
| Grand Prix Kitakyushu 2005 | Q | | Oiso, Masashi (2203) | Won 2-1 | Ishida, Itaru (2056) |
| Pro Tour Yokohama 2007 | 8 | 13 | Oiso, Masashi (1838) | Won 2-1 | Ishida, Itaru (1896) |