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