Clark, Donald
Current rating: 1443
| Grand Prix Pittsburgh 2017 (AER standard) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 235 | Wible, Mike (1396) | Won 2-0 | +171429 |
| 2standard | 200 | Loysen, Lucas (1470) | Won 2-0 | +191448 |
| 3standard | 93 | Huck, Kyle (1535) | Lost 0-2 | -161432 |
| 4standard | 206 | Raffensberger, Michael (1562) | Won 2-0 | +201452 |
| 5standard | 164 | Lindly, Dylan (1545) | Won 2-1 | +201472 |
| 6standard | 63 | Morris, Adam (1553) | Draw 1-1 | +11473 |
| 7standard | 133 | Job, Jonathan (1715) | Lost 0-2 | -131460 |
| 8standard | 225 | Glackin, Ryan (1523) | Lost 0-2 | -171443 |
| top | average opponent: 1537record: 4-3-1 | new rating: 1443 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 443 | Morris, Ryan (1450) | Lost 0-2 | -181446 |
| 2modern | 575 | Ponting, Kory (1524) | Lost 0-2 | -161430 |
| 3modern | 643 | Herrera, Alfredo (1434) | Lost 0-2 | -181412 |
| top | average opponent: 1470record: 0-3 | new rating: 1412 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 1103 | Vance, Gary (1500) | Won 2-0 | +181518 |
| 2legacy | 761 | Petroske, Alex (1534) | Lost 0-2 | -181500 |
| 3legacy | 1125 | Loke, Jun Yin (1422) | Lost 0-2 | -191481 |
| 4legacy | 1188 | Rocus, Andy (1502) | Won 2-1 | +181499 |
| 5legacy | 869 | Chen, Gary (1545) | Lost 0-2 | -171482 |
| 6legacy | 976 | Winslow, Nathan (1498) | Lost 0-2 | -181464 |
| top | average opponent: 1500record: 2-4 | new rating: 1464 | ||