Sheffield, Jason
Current rating: 1620
Record: 19-13-2
| Grand Prix Atlanta 2015 (BFZ limited) | starting rating: 1635 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 638 | Izsak, Llanie (1493) | Lost 0-2 | -211614 |
| 2sealed | 547 | Gaston, Brandon (1484) | Won 2-0 | +161630 |
| 3sealed | 474 | Remmes, James (1585) | Won 2-0 | +171647 |
| 4sealed | 591 | Swan, Thomas (1617) | Won 2-0 | +181665 |
| 5sealed | 179 | Snider, Nicholas (1549) | Lost 0-2 | -211644 |
| 6sealed | 481 | Yeh, Martin (1529) | Lost 0-2 | -201624 |
| 7sealed | 434 | Lizzi, Adam (1539) | Lost 0-2 | -191605 |
| 8sealed | 376 | Siu, Kenny (1485) | Won 2-0 | +161621 |
| 9sealed | 311 | Cappetta, G. J. (1560) | Draw 1-1 | -11620 |
| top | average opponent: 1538record: 4-4-1 | new rating: 1620 | ||
| Grand Prix Dallas-Fort Worth 2015 (ORI limited) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 324 | Loya, Darrell (1557) | Won 2-0 | +201487 |
| 2sealed | 69 | Wardlaw, Tanner (1500) | Lost 1-2 | -181469 |
| 3sealed | 365 | Rice, Christian (1497) | Lost 1-2 | -181451 |
| 4sealed | 666 | Dixon, Jessica (1482) | Won 2-0 | +191470 |
| 5sealed | 550 | Henkelman, Brad (1501) | Won 2-1 | +191489 |
| 6sealed | 434 | Bandy, Mark (1488) | Won 2-0 | +181507 |
| 7sealed | 300 | Andersen, Christoffer (1889) | Won 2-1 | +241531 |
| 8sealed | 158 | Hamilton, Brittany (1509) | Won 2-1 | +181549 |
| 9sealed | 131 | Clark, Jason (1662) | Won 2-1 | +201569 |
| 10draft | 87 | May, Preston (1595) | Won 2-1 | +181587 |
| 11draft | 99 | Billingslea, Blake (1610) | Draw 1-1 | +11588 |
| 12draft | 80 | Jacobs, Adam (1585) | Won 2-1 | +181606 |
| 13draft | 62 | van Ravenzwaaij, Don (2054) | Won 2-1 | +251631 |
| 14draft | 75 | Billingslea, Blake (1650) | Lost 1-2 | -171614 |
| 15draft | 85 | May, Parker (1791) | Won 2-1 | +211635 |
| top | average opponent: 1625record: 11-3-1 | new rating: 1635 | ||
| Grand Prix Houston 2013 (DGM limited) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 171 | Melvin, Paul (1527) | Lost 0-2 | -181466 |
| 2sealed | 252 | Hosey, Justin (1482) | Lost 1-2 | -171449 |
| 3sealed | 363 | Amaro, Luis (1464) | Won 2-0 | +181467 |
| top | average opponent: 1491record: 1-2 | new rating: 1467 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 116 | Stoddard, Samuel (1723) | Lost 1-2 | -141486 |
| 3sealed | 239 | Hoffmann, Andrew (1500) | Won 2-0 | +181504 |
| 4sealed | 124 | Tam, Wai (1282) | Won 2-0 | +141518 |
| 5sealed | 158 | Fox, Adam M (1606) | Lost 0-2 | -161502 |
| 6sealed | 148 | Payne, Ryan (1519) | Won 2-0 | +181520 |
| 7sealed | 122 | Mack, Kyle (1521) | Lost 1-2 | -181502 |
| 8sealed | 110 | Ingersoll, Chris (1470) | Lost 0-2 | -181484 |
| top | average opponent: 1517record: 3-4 | new rating: 1484 | ||