Johnson, Preston
Current rating: 1475
Record: 12-15
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 152 | Bamberg, Ethan (1490) | Lost 0-2 | -171448 |
| 2pioneer | 236 | Beckham, Zenaide (1506) | Won 2-1 | +191467 |
| 3pioneer | 311 | Godfrey, Gwenn (1499) | Won 2-0 | +191486 |
| 4pioneer | 286 | Withers, Matthew (1541) | Lost 1-2 | -171469 |
| 5pioneer | 357 | Newport, Christopher (1504) | Won 2-0 | +181487 |
| 6pioneer | 203 | Vinciguerra, Daniele (1819) | Lost 0-2 | -121475 |
| top | average opponent: 1560record: 3-3 | new rating: 1475 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 664 | Allison, Joshua (1478) | Lost 1-2 | -181445 |
| 2modern | 802 | White, Antonio (1489) | Won 2-1 | +191464 |
| 3modern | 936 | Grimm, Collin (1498) | Won 2-1 | +191483 |
| 4modern | 705 | Sendaydiego, Curt (1533) | Lost 1-2 | -181465 |
| top | average opponent: 1499record: 2-2 | new rating: 1465 | ||
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1427 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 299 | Murphy, Timothy (1514) | Won 2-0 | +201447 |
| 2legacy | 332 | Huang, Bob (1814) | Lost 1-2 | -121435 |
| 3legacy | 668 | Vaz De Melo, Juliano (1440) | Won 2-1 | +181453 |
| 4legacy | 750 | Smith, Jared (1402) | Won 2-0 | +171470 |
| 5legacy | 2141 | Juan, William (1703) | Lost 0-2 | -141456 |
| 6legacy | 2124 | Henderson, Joshua (1435) | Won 2-0 | +181474 |
| 7legacy | 383 | Villanueva, John Francis (1577) | Won 2-0 | +201494 |
| 8legacy | 378 | Singer, Sean (1663) | Lost 1-2 | -151479 |
| 9legacy | 441 | Zinni, Anthony (1592) | Lost 1-2 | -161463 |
| top | average opponent: 1571record: 5-4 | new rating: 1463 | ||
| Grand Prix Omaha 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 395 | Kurtenbach, Kevin (1500) | Lost 0-2 | -181482 |
| 2modern | 420 | Badker, Tim (1483) | Lost 0-2 | -181464 |
| 3modern | 475 | Martin, Bob (1483) | Lost 0-2 | -181446 |
| 4modern | 519 | Farris, Michael (1446) | Won 2-1 | +181464 |
| 5modern | 446 | Cook, Aaron (1429) | Lost 1-2 | -181446 |
| 6modern | 402 | Hall, Marc (1448) | Lost 0-2 | -181428 |
| 7modern | 343 | Rogers, Bryan (1382) | Won 2-1 | +171445 |
| 8modern | 271 | Drews, Kyle (1446) | Lost 0-2 | -181427 |
| top | average opponent: 1452record: 2-6 | new rating: 1427 | ||