| event | round | table | player one | result | player two |
| Grand Prix Atlantic City 2013 | 15 | 2 | Costa, Matthew (1900) | Won 2-0 | Stern, Jon (1947) |
| Grand Prix Atlantic City 2013 | Q | Costa, Matthew (1919) | Lost 0-2 | Stern, Jon (1928) | |
| Grand Prix Quebec City 2013 | 11 | 41 | Costa, Matthew (1799) | Won 2-0 | Stern, Jon (2029) |
| Grand Prix Baltimore 2014 | 13 | 47 | Costa, Matthew (2018) | Won 2-0 | Stern, Jon (1967) |
| Grand Prix Toronto 2015 | 8 | 40 | Costa, Matthew (1944) | Lost 0-2 | Stern, Jon (1938) |