| event | round | table | player one | result | player two |
| Grand Prix Manila 2008 | 7 | 43 | Iyanaga, Junya (1981) | Lost 1-2 | Sugaya, Hironobu (1658) |
| Grand Prix Singapore 2009 | 13 | 11 | Iyanaga, Junya (1945) | Won 2-1 | Sugaya, Hironobu (1836) |
| Grand Prix Kitakyushu 2009 | 14 | 35 | Iyanaga, Junya (1951) | ID | Sugaya, Hironobu (1924) |
| Grand Prix Kitakyushu 2009 | Q | Iyanaga, Junya (1951) | Won 2-1 | Sugaya, Hironobu (1924) |