Prater, James
Current rating: 1430
Record: 14-20-1
| Grand Prix Atlantic City 2015 (DTK limited) | starting rating: 1419 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 204 | McDaniel, Murphy (1500) | Won 2-1 | +201439 |
| 2sealed | 97 | Zhu, Mengou (1517) | Lost 0-2 | -171422 |
| 3sealed | 576 | Cerqueira, Bruno (1485) | Won 2-1 | +191441 |
| 4sealed | 222 | Sheres, Evan (1544) | Won 2-0 | +201461 |
| 5sealed | 183 | Saunders, Peter (1642) | Lost 0-2 | -151446 |
| 6sealed | 411 | Fiduk, Francis (1536) | Lost 1-2 | -161430 |
| top | average opponent: 1537record: 3-3 | new rating: 1430 | ||
| Grand Prix Philadelphia 2012 (RTR limited) | starting rating: 1410 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 230 | Parshall, William (1502) | Lost 0-2 | -171393 |
| 2sealed | 303 | Liberman, Eric D (1496) | Lost 0-2 | -161377 |
| 3sealed | 416 | Wallace, Scott (1413) | Won 2-1 | +191396 |
| 4sealed | 358 | Avila, Daniel (1491) | Won 2-1 | +201416 |
| 5sealed | 244 | Swisher, Samuel S (1485) | Won 2-0 | +191435 |
| 6sealed | 253 | Mehra, Rajesh (1520) | Draw 1-1 | +11436 |
| 7sealed | 203 | Crane, Paul (1471) | Lost 1-2 | -171419 |
| top | average opponent: 1482record: 3-3-1 | new rating: 1419 | ||
| Grand Prix New Jersey 2006 (TSP limited) | starting rating: 1418 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 24 | Montalvo, Radames (1500) | Lost 0-2 | -161402 |
| 2sealed | 325 | Wallace, Jason (1468) | Won 2-0 | +191421 |
| 3sealed | 256 | Jacobson, Josh (1412) | Lost 0-2 | -181403 |
| 4sealed | 359 | Barna, Chris (1482) | Lost 0-2 | -171386 |
| 5sealed | 323 | Yandell, Chris (1465) | Won 2-0 | +201406 |
| 6sealed | 269 | Fletcher, Fran (1459) | Won 2-0 | +191425 |
| 7sealed | 205 | Tse, Jay (1602) | Lost 0-2 | -151410 |
| top | average opponent: 1484record: 3-4 | new rating: 1410 | ||
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 101 | Snyder, Derek (1521) | Won 2-1 | +191452 |
| 2sealed | 112 | Cupo, Tom (1501) | Lost 0-2 | -171435 |
| 3sealed | 184 | Kolbig, Kent (1483) | Lost 0-2 | -171418 |
| top | average opponent: 1502record: 1-2 | new rating: 1418 | ||
| Grand Prix Philadelphia 2002 (ONS rochester) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 69 | Schwartz, Greg S (1500) | Lost 0-2 | -171429 |
| 2sealed | 194 | Bell, Jeff (1479) | Won 2-1 | +191448 |
| 3sealed | 128 | Krywicki, Jared (1501) | Lost 0-2 | -171431 |
| 4sealed | 215 | Lysik, Bruce (1500) | Won 2-0 | +191450 |
| 5sealed | 158 | Swan, Gregory (1504) | Lost 0-2 | -171433 |
| top | average opponent: 1497record: 2-3 | new rating: 1433 | ||
| Grand Prix Memphis 1999 (Urza's block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 99 | Sutton, Ron (1500) | Lost 0-0 | -181482 |
| 2block | 148 | Powers, Sam (1482) | Won 0-0 | +181500 |
| 3block | 128 | Pakis, Paul (1500) | Won 0-0 | +181518 |
| 4block | 74 | Guendulay, Mario (1517) | Lost 0-0 | -181500 |
| 5block | 115 | Pile, Douglas (1500) | Lost 0-0 | -181482 |
| 6block | 105 | Hayes, William (1482) | Lost 0-0 | -181464 |
| 7block | 92 | Liston, Denver (1448) | Lost 0-0 | -181446 |
| top | average opponent: 1490record: 2-5 | new rating: 1446 | ||