| event | round | table | player one | result | player two |
| Grand Prix Philadelphia 2005 | 12 | 6 | Lebedowicz, Osyp (1935) | Lost 1-2 | Sonne, Jonathan (1912) |
| Grand Prix Charlotte 2005 | 4 | 52 | Lebedowicz, Osyp (1841) | Draw 1-1 | Sonne, Jonathan (2010) |
| Pro Tour Geneva 2007 | 5 | 119 | Lebedowicz, Osyp (1950) | Lost 0-2 | Sonne, Jonathan (1960) |