Kenji Tsumura trails the series against
Masashi Oiso, 3-4.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Utsunomiya 2002 | 10 | 3 | Tsumura, Kenji (1606) | Lost 1-2 | Oiso, Masashi (1716) |
| Grand Prix Matsuyama 2005 | 8 | 20 | Tsumura, Kenji (1850) | Lost 1-2 | Oiso, Masashi (2019) |
| Grand Prix Niigata 2005 | Q | | Tsumura, Kenji (1937) | Lost 0-2 | Oiso, Masashi (2230) |
| Grand Prix Phoenix 2006 | 5 | 44 | Tsumura, Kenji (2115) | Lost 0-2 | Oiso, Masashi (1872) |
| Grand Prix Okayama 2008 | 6 | 86 | Tsumura, Kenji (1887) | Won 2-1 | Oiso, Masashi (1719) |
| 2008 World Championship | 17 | 5 | Tsumura, Kenji (2002) | Won 2-0 | Oiso, Masashi (1893) |
| Pro Tour Shadows over Innistrad | 1 | 125 | Tsumura, Kenji (1734) | Won 2-1 | Oiso, Masashi (2032) |