, 4-2.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Houston 2010 | 12 | 9 | Turtenwald, Owen (1951) | Lost 0-2 | Costa, Matthew (1701) |
| Grand Prix Indianapolis 2012 | 6 | 3 | Turtenwald, Owen (2039) | Lost 1-2 | Costa, Matthew (2096) |
| Grand Prix Washington DC 2013 | 13 | 5 | Turtenwald, Owen (1996) | Won 2-1 | Costa, Matthew (2085) |
| Grand Prix Las Vegas 2015 (1) | 9 | 4 | Turtenwald, Owen (2039) | Won 2-0 | Costa, Matthew (1955) |
| Grand Prix San Diego 2015 | 9 | 7 | Turtenwald, Owen (1996) | Won 2-0 | Costa, Matthew (1906) |
| Pro Tour Aether Revolt | 16 | 21 | Turtenwald, Owen (2163) | Won 2-0 | Costa, Matthew (2065) |