Mattox, William
Current rating: 1479
Record: 5-6-1
| Grand Prix Atlanta 2018 (modern) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 197 | Padilla, Pedro (1440) | Lost 1-2 | -191461 |
| 2modern | 525 | Williamson, Matthew (1483) | Won 2-0 | +191480 |
| 3modern | 421 | Theriault, Garron (1503) | Won 2-0 | +181498 |
| 4modern | 480 | Lloyd, Alex (1501) | Draw 1-1 | 01498 |
| 5modern | 356 | Farrar, Joel (1518) | Lost 0-2 | -171481 |
| 6modern | 479 | Fagan, Matthew (1500) | Won 2-1 | +181499 |
| 7modern | 357 | Zheng, Kai (1418) | Lost 0-2 | -201479 |
| average opponent: 1480record: 3-3-1 | new rating: 1479 | |||
| Grand Prix San Francisco 2007 (Time Spiral block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 186 | Henry, Jason (1408) | Won 2-1 | +161516 |
| 2block | 88 | Melikian, Van (1519) | Lost 0-2 | -181498 |
| 3block | 230 | Candreva, Christopher (1499) | Won 2-0 | +181516 |
| 4block | 107 | Zolnoski, Roy W (1500) | Lost 1-2 | -181498 |
| 5block | 205 | Wiser, Robert (1499) | Lost 0-2 | -181480 |
| average opponent: 1485record: 2-3 | new rating: 1480 | |||