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