| event | round | table | player one | result | player two |
| Grand Prix Niigata 2009 | 7 | 40 | Ishimaru, Ken (1701) | Won 2-1 | Akita, Naoto (1581) |
| Grand Prix Nagoya 2016 | 8 | 81 | Ishimaru, Ken (1816) | Lost 1-2 | Akita, Naoto (1640) |
| Grand Prix Kyoto 2019 | 2 | 192 | Ishimaru, Ken (1701) | Won 2-0 | Akita, Naoto (1462) |