Duke, Joshua
Current rating: 1470
| Grand Prix Atlanta 2011 (extended) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 467 | Willis, Kevin D (1500) | Won 2-1 | +181524 |
| 2extended | 447 | Brazzell, Davis (1460) | Won 2-1 | +171541 |
| 3extended | 467 | Drennen, Phillip (1525) | Lost 0-2 | -181523 |
| 4extended | 547 | Baugh, Walter (1518) | Lost 1-2 | -181505 |
| 5extended | 575 | Parson, Lukas (1563) | Lost 1-2 | -171488 |
| 6extended | 595 | Calway, Cory (1484) | Lost 0-2 | -181470 |
| top | average opponent: 1508record: 2-4 | new rating: 1470 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 47 | Fenstermaker, Dean (1533) | Won 2-0 | +181520 |
| 2sealed | 88 | O'Bryant, Christopher (1522) | Won 2-0 | +191539 |
| 3sealed | 27 | Berger, Eric (1747) | Lost 0-2 | -151524 |
| 4sealed | 184 | Mowry, Nicholas R (1525) | Lost 0-2 | -181506 |
| top | average opponent: 1582record: 2-2 | new rating: 1506 | ||
| Grand Prix Tampa 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 170 | Magnan, Bronson (1529) | Lost 1-2 | -171483 |
| 3sealed | 236 | Lees, Josh (1502) | Won 2-0 | +181501 |
| 4sealed | 174 | Griffith, Cole (1498) | Won 2-0 | +181519 |
| 5sealed | 150 | Lundblad, Erik (1567) | Won 2-0 | +191538 |
| 6sealed | 76 | Lum, Jonathan (1537) | Lost 1-2 | -181520 |
| 7sealed | 120 | Williams, Jeff j (1532) | Lost 1-2 | -181502 |
| top | average opponent: 1528record: 3-3 | new rating: 1502 | ||