Prephan, David
Current rating: 1545
Record: 31-31-3
| Grand Prix Toronto 2013 (THS limited) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 232 | Bentley, Johnathan (1589) | Won 2-1 | +191544 |
| 4sealed | 23 | Lohrenz, Will (1447) | Won 2-1 | +161560 |
| 5sealed | 176 | Brown, Max (1715) | Won 2-0 | +211581 |
| 6sealed | 3 | LeRoux, Colette (1539) | Won 2-1 | +171598 |
| 7sealed | 4 | Yu, Fred (1647) | Lost 0-2 | -171581 |
| 8sealed | 13 | Lovin, Mark (1685) | Lost 0-2 | -161565 |
| 9sealed | 69 | Seelye, Lisa (1427) | Lost 0-2 | -201545 |
| top | average opponent: 1578record: 4-3 | new rating: 1545 | ||
| Grand Prix Louisville 2013 (THS standard) | starting rating: 1596 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 124 | Dunn, Marc (1534) | Won 2-0 | +161612 |
| 4standard | 144 | Castor, Kenny (1937) | Lost 0-2 | -121600 |
| 5standard | 251 | Turner, Audis (1535) | Lost 0-2 | -191581 |
| 6standard | 366 | Shaw, John (1590) | Lost 1-2 | -181563 |
| 7standard | 376 | Peterson, Nathan (1501) | Lost 0-2 | -191544 |
| 8standard | 331 | Cook, Nathaniel (1484) | Lost 1-2 | -191525 |
| top | average opponent: 1597record: 1-5 | new rating: 1525 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1622 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 128 | Brandon, Kyle (1534) | Lost 1-2 | -201602 |
| 4modern | 263 | Wanich, Mark (1542) | Lost 0-2 | -191583 |
| 5modern | 405 | Eales, Andrew (1466) | Lost 0-2 | -201563 |
| 6modern | 480 | Holness, Trevor (1447) | Won 2-0 | +161579 |
| 7modern | 381 | Conrad, Harry (1497) | Won 0-0 | +161595 |
| 8modern | 306 | Thoune, RJ (1629) | Won 2-0 | +191614 |
| 9modern | 299 | Biron, Pierre-Alexandre (1592) | Lost 1-2 | -181596 |
| top | average opponent: 1530record: 3-4 | new rating: 1596 | ||
| Grand Prix Pittsburgh 2013 (GTC limited) | starting rating: 1630 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 332 | Gardner, Joe A (1578) | Lost 0-2 | -191611 |
| 3sealed | 459 | Bishop, Jesse (1499) | Won 2-0 | +161627 |
| 4sealed | 401 | Valentine, AJ (1521) | Lost 0-2 | -201607 |
| 5sealed | 546 | King, Jeremy (1442) | Won 2-0 | +151622 |
| top | average opponent: 1510record: 2-2 | new rating: 1622 | ||
| Grand Prix Indianapolis 2013 (RTR limited) | starting rating: 1585 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 138 | Burns, Mitchell (1518) | Won 2-0 | +171602 |
| 3sealed | 87 | Friedman, Samuel (1621) | Won 2-0 | +191621 |
| 4sealed | 14 | Guild, Jacob (1635) | Won 2-1 | +181639 |
| 5sealed | 17 | Cioffi, Alex (1560) | Won 2-1 | +161655 |
| 6sealed | 287 | Forsberg, Ryan (1745) | Won 2-0 | +201675 |
| 7sealed | 4 | Walker, Noah (1659) | Lost 1-2 | -181657 |
| 8sealed | 119 | Martell, Tom (1997) | Lost 1-2 | -121645 |
| 9sealed | 86 | DeTora, Melissa (1802) | Lost 0-2 | -151630 |
| top | average opponent: 1692record: 5-3 | new rating: 1630 | ||
| Grand Prix Toronto 2012 (modern) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 199 | DeSantis, David (1465) | Won 2-1 | +181525 |
| 3modern | 112 | Gareau, Philippe (1702) | Won 2-1 | +211546 |
| 4modern | 68 | Tyson, Bryant (1530) | Won 2-1 | +181564 |
| 5modern | 63 | McCluskie, Ted (1556) | Won 2-1 | +171581 |
| 6modern | 31 | Burningham, Kris (1573) | Won 2-1 | +181599 |
| 7modern | 12 | Wilson, Jacob (2083) | Lost 1-2 | -101589 |
| 8modern | 23 | Asselin, Philippe (1724) | Won 2-1 | +211610 |
| 9modern | 10 | Brown, Max (1647) | Lost 0-2 | -171593 |
| 10modern | 49 | Tietze, Maxwell (1914) | Won 2-1 | +231616 |
| 11modern | 37 | Jordan, Daniel (2019) | Lost 0-2 | -111605 |
| 12modern | 31 | Richard, Francois (1499) | Draw 1-1 | -21603 |
| 13modern | 43 | Bastos, Frederico (1702) | Lost 0-0 | -161587 |
| 14modern | 50 | Naylor, Andrew (1514) | Won 2-1 | +171604 |
| 15modern | 41 | Dunkelman, Steven (1588) | Lost 0-2 | -191585 |
| top | average opponent: 1680record: 8-5-1 | new rating: 1585 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1453 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 14 | Edwards, Adam (1518) | Won 2-0 | +191472 |
| 3modern | 124 | Usary, Marsh (1580) | Lost 0-2 | -161456 |
| 4modern | 261 | Carroll, Chad (1390) | Lost 1-2 | -191437 |
| 5modern | 335 | Szwabowski, Ben (1500) | Won 2-0 | +191456 |
| 6modern | 254 | McGraw, Nathan (1525) | Won 2-1 | +191475 |
| 7modern | 183 | Lee, Jackie (1793) | Won 2-1 | +241499 |
| 8modern | 77 | Somers, Stu (1628) | Won 2-1 | +201519 |
| 9modern | 103 | Calcano, Christian (1863) | Lost 0-2 | -121507 |
| top | average opponent: 1600record: 5-3 | new rating: 1507 | ||
| Grand Prix Nashville 2012 (DKA limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 33 | Stafford, Noah (1500) | Draw 1-1 | +11465 |
| 2sealed | 263 | Chiem, Chan (1500) | Won 2-0 | +181483 |
| 3sealed | 189 | Long, Clayton (1516) | Lost 0-2 | -171466 |
| 4sealed | 357 | Stack, Alexander R (1448) | Lost 0-2 | -181448 |
| 5sealed | 396 | Matlock, Mark A (1481) | Won 2-0 | +181466 |
| 6sealed | 326 | Hatley, Jake (1499) | Draw 1-1 | +11467 |
| 7sealed | 291 | Miller, Colin (1710) | Lost 1-2 | -141453 |
| top | average opponent: 1522record: 2-3-2 | new rating: 1453 | ||
| Grand Prix Indianapolis 2012 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 54 | Killy, Kevin (1500) | Won 2-0 | +181518 |
| 2legacy | 20 | Fitzgerald, Zachary (1646) | Lost 0-2 | -161502 |
| 3legacy | 339 | Hiser, Andrew (1499) | Lost 0-2 | -181484 |
| 4legacy | 100 | Harris, Rocky (1360) | Lost 0-2 | -201464 |
| top | average opponent: 1501record: 1-3 | new rating: 1464 | ||