Johnston, Jason
Current rating: 1456
Record: 4-7
| Grand Prix Orlando 2017 (AER limited) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 908 | Kovalcik, JR (1395) | Lost 0-2 | -201482 |
| 2sealed | 933 | Pavilonis, Christopher (1613) | Lost 1-2 | -151467 |
| 3sealed | 1094 | Fulgium, James (1976) | Lost 0-2 | -101457 |
| 4sealed | 1138 | Potter, Eric (1445) | Won 2-0 | +181475 |
| 5sealed | 1068 | Gilbert, Michael (1396) | Lost 0-2 | -191456 |
| average opponent: 1565record: 1-4 | new rating: 1456 | |||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1388 | Lonski, Joseph (1500) | Won 2-0 | +181518 |
| 2modern | 1448 | Baller, Michael (1498) | Lost 1-2 | -181500 |
| 3modern | 1535 | Lin, David (1536) | Lost 1-2 | -181482 |
| 4modern | 1565 | Hockey, Shelby (1343) | Won 2-1 | +161498 |
| 5modern | 1380 | Shoaf, Nicholas (1629) | Won 2-0 | +201518 |
| 6modern | 1279 | Paul, Corey (1636) | Lost 0-2 | -161502 |
| average opponent: 1524record: 3-3 | new rating: 1502 | |||