Preston, Brian
Current rating: 1402
Record: 15-21
| Grand Prix Denver 2019 (M20 standard) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 220 | Sughroue, Daniel (1364) | Lost 0-2 | -211459 |
| 2standard | 256 | Piles, James (1395) | Lost 0-2 | -191440 |
| 3standard | 305 | Clark, Jay (1305) | Lost 0-2 | -201420 |
| 4standard | 288 | Bontempo, Braden (1428) | Lost 0-2 | -181402 |
| top | average opponent: 1373record: 0-4 | new rating: 1402 | ||
| Grand Prix Oakland 2019 (modern) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 241 | Stancik, Jack (1424) | Lost 0-2 | -201516 |
| 2modern | 420 | White, Patrick (1482) | Won 2-1 | +171533 |
| 3modern | 428 | Contreras, Cameron (1544) | Lost 0-2 | -181515 |
| 4modern | 394 | Romero, Guillermo (1514) | Lost 1-2 | -181497 |
| 5modern | 455 | Higley, Michael (1523) | Lost 0-2 | -171480 |
| top | average opponent: 1497record: 1-4 | new rating: 1480 | ||
| Grand Prix Sacramento 2018 (M19 limited) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 311 | Carlson, Anders (1504) | Won 2-1 | +171551 |
| 2sealed | 55 | Pospischil, Mark (1520) | Won 2-0 | +181569 |
| 3sealed | 11 | Castillo, Zaryn (1833) | Lost 0-2 | -141555 |
| 4sealed | 244 | Nanez, Niko (1455) | Lost 0-2 | -191536 |
| top | average opponent: 1578record: 2-2 | new rating: 1536 | ||
| Grand Prix Denver 2017 (HOU standard) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 39 | Pallesen, Johnathon (1499) | Won 2-1 | +191481 |
| 2standard | 205 | Martin, Andy (1462) | Won 2-0 | +171498 |
| 3standard | 228 | Dayton, James (1535) | Won 2-1 | +191517 |
| 4standard | 27 | Andersen, Keaton (1556) | Won 2-0 | +191536 |
| 5standard | 39 | Coleman, Jonathan (1473) | Lost 0-2 | -201516 |
| 6standard | 61 | Wyatt, Joseph (1493) | Won 2-0 | +181534 |
| 7standard | 78 | Maldonado, Carlos (1577) | Won 2-1 | +191553 |
| 8standard | 11 | Kelly, Michael (1609) | Lost 0-2 | -171536 |
| 9standard | 44 | McMahon, Christopher (1769) | Lost 0-2 | -141522 |
| 10standard | 143 | Roberts, Grayson (1713) | Won 2-0 | +211543 |
| 11standard | 56 | Guan, Thomas Zhennan (1696) | Lost 1-2 | -151528 |
| 12standard | 131 | Keller, Koby (1632) | Won 2-0 | +201548 |
| 13standard | 99 | Anderson, William (1679) | Won 2-0 | +201568 |
| 14standard | 83 | Hurtado, Patrick (1705) | Lost 0-2 | -151553 |
| 15standard | 79 | Buchanan, Drew (1490) | Lost 0-2 | -191534 |
| top | average opponent: 1592record: 9-6 | new rating: 1534 | ||
| Grand Prix Denver 2016 (KLD standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 3 | Jackson, Brady (1500) | Lost 0-2 | -181482 |
| 2standard | 436 | Laney, Ryan (1482) | Lost 1-2 | -181464 |
| 3standard | 651 | Gaard, Sam (1449) | Lost 0-2 | -181446 |
| 4standard | 721 | Carlson, Cory (1446) | Lost 0-2 | -181428 |
| 5standard | 709 | Miville, Matthew (1426) | Won 0-0 | +181446 |
| 6standard | 636 | Candelore, Adam (1420) | Won 2-0 | +171463 |
| 7standard | 553 | Nicely, Cody (1422) | Won 2-0 | +171480 |
| 8standard | 427 | Dixon, Jay (1448) | Lost 0-2 | -181462 |
| top | average opponent: 1449record: 3-5 | new rating: 1462 | ||