| event | round | table | player one | result | player two |
| Grand Prix Kitakyushu 2007 | 14 | 10 | Shiozu, Ryouma (1834) | Lost 1-2 | Iyanaga, Junya (1928) |
| Grand Prix Shizuoka 2008 | 4 | 51 | Shiozu, Ryouma (1812) | Lost 0-2 | Iyanaga, Junya (1942) |
| Grand Prix Kobe 2008 | 12 | 34 | Shiozu, Ryouma (1806) | Won 2-1 | Iyanaga, Junya (2008) |