| event | round | table | player one | result | player two |
| Grand Prix Yokohama 2004 | 2 | 114 | Watanabe, Yuuya (1554) | Lost 1-2 | Mitamura, Kazuya (1624) |
| Grand Prix Kobe 2009 | 4 | 44 | Watanabe, Yuuya (1879) | Draw 1-1 | Mitamura, Kazuya (1891) |
| Grand Prix Melbourne 2009 | 12 | 4 | Watanabe, Yuuya (2105) | Won 2-1 | Mitamura, Kazuya (1987) |
| Grand Prix Tampa 2009 | 9 | 9 | Watanabe, Yuuya (2236) | Won 2-1 | Mitamura, Kazuya (2046) |
| Grand Prix Oakland 2010 | 6 | 22 | Watanabe, Yuuya (2140) | Lost 0-2 | Mitamura, Kazuya (1936) |
| Grand Prix Manila 2010 | 15 | 6 | Watanabe, Yuuya (2016) | Won 2-0 | Mitamura, Kazuya (1781) |