Herdman, James
Current rating: 1556
| Grand Prix Tampa 2009 (ZEN limited) | starting rating: 1551 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 65 | Bazhanov, Vlad (1517) | Lost 0-2 | -181533 |
| 3sealed | 212 | McNeil, Gary (1500) | Won 2-0 | +171550 |
| 4sealed | 217 | Reilly, Michael (1663) | Won 2-0 | +201570 |
| 5sealed | 76 | Hu, Haibing (1722) | Lost 1-2 | -151555 |
| 6sealed | 181 | Chatham, Charles (1640) | Won 2-0 | +201575 |
| 7sealed | 141 | Disconzi, Romolo (1538) | Lost 1-2 | -191556 |
| top | average opponent: 1597record: 3-3 | new rating: 1556 | ||
| Grand Prix Daytona Beach 2007 (LRW limited) | starting rating: 1572 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 104 | Dobbertin, Ty (1637) | Won 2-1 | +191591 |
| 4sealed | 80 | Horowitz, Steve (1598) | Won 2-0 | +181609 |
| 5sealed | 22 | Landale, Tim (1497) | Lost 0-2 | -201589 |
| 6sealed | 40 | Pham, Ryan (1541) | Lost 0-2 | -191570 |
| 7sealed | 94 | Yeung, Wilbert (1521) | Lost 0-2 | -191551 |
| top | average opponent: 1559record: 2-3 | new rating: 1551 | ||
| Grand Prix Orlando 2004 (Mirrodin block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 90 | Pfaff, Mike (1500) | Won 2-0 | +181518 |
| 2block | 101 | Vann, Cheltsey (1518) | Won 2-1 | +181536 |
| 3block | 21 | Meyer, Chris (1535) | Won 2-1 | +181554 |
| 4block | 30 | Himes, Chad (1500) | Lost 1-2 | -191535 |
| 5block | 40 | Parnell, Taylor (1493) | Won 2-0 | +171552 |
| 6block | 38 | Upham, Bryan (1584) | Won 2-0 | +191571 |
| 7block | 37 | O'Rourke, Jason (1480) | Won 2-0 | +161587 |
| 8block | 8 | Bonneville, Tim (1741) | Lost 1-2 | -151572 |
| top | average opponent: 1544record: 6-2 | new rating: 1572 | ||