Masashi Oiso is tied in the series against
Akira Asahara, 3-3-2.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Kyoto 2003 | 10 | 32 | Oiso, Masashi (1762) | Won 2-1 | Asahara, Akira (1953) |
| Grand Prix Kyoto 2003 | 12 | 15 | Oiso, Masashi (1797) | Lost 1-2 | Asahara, Akira (1944) |
| Grand Prix Yokohama 2004 | 14 | 5 | Oiso, Masashi (2049) | Lost 0-2 | Asahara, Akira (1987) |
| Grand Prix Matsuyama 2005 | 14 | 21 | Oiso, Masashi (2084) | ID | Asahara, Akira (2009) |
| Grand Prix Matsuyama 2005 | F | | Oiso, Masashi (2111) | Lost 0-2 | Asahara, Akira (2035) |
| Grand Prix Niigata 2005 | 14 | 1 | Oiso, Masashi (2230) | ID | Asahara, Akira (2079) |
| Pro Tour Honolulu 2006 | 8 | 33 | Oiso, Masashi (2058) | Won 2-1 | Asahara, Akira (2109) |
| Grand Prix Kitakyushu 2009 | 8 | 1 | Oiso, Masashi (1923) | Won 2-1 | Asahara, Akira (1966) |