| event | round | table | player one | result | player two |
| Pro Tour Columbus 2004 | 10 | 1 | Oiso, Masashi (2017) | Won 2-1 | Siron, Geoffrey (1924) |
| Pro Tour London 2005 | 7 | 30 | Oiso, Masashi (2160) | Lost 1-2 | Siron, Geoffrey (1798) |
| Pro Tour London 2005 | 13 | 11 | Oiso, Masashi (2202) | ID | Siron, Geoffrey (1887) |
| Pro Tour London 2005 | Q | Oiso, Masashi (2202) | Lost 0-3 | Siron, Geoffrey (1887) | |
| Pro Tour Los Angeles 2005 | 10 | 32 | Oiso, Masashi (2150) | Lost 0-2 | Siron, Geoffrey (1930) |