| event | round | table | player one | result | player two |
| Grand Prix Bangkok 2007 | 12 | 15 | Iyanaga, Junya (1908) | Lost 0-2 | Ong, Kok Seng (1871) |
| Grand Prix Bangkok 2007 | Q | Iyanaga, Junya (1911) | Lost 1-2 | Ong, Kok Seng (1889) | |
| Grand Prix Bangkok 2009 | 6 | 5 | Iyanaga, Junya (1942) | Won 2-0 | Ong, Kok Seng (1855) |
| 2010 World Championship | 11 | 150 | Iyanaga, Junya (1894) | Won 2-1 | Ong, Kok Seng (1854) |