Marshello, Donald
Current rating: 1420
Record: 9-16-2
| Grand Prix Reno 2020 (THB limited) | starting rating: 1415 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 111 | Raff, Michael (1500) | Won 2-1 | +191434 |
| 2sealed | 129 | Pierce, Herbert (1465) | Draw 1-1 | +11435 |
| 3sealed | 156 | Saunders, James (1523) | Lost 1-2 | -161419 |
| 4sealed | 217 | Loos, Bart (1476) | Won 2-1 | +191438 |
| 5sealed | 150 | Nguyen, Khang (1455) | Lost 0-2 | -181420 |
| top | average opponent: 1484record: 2-2-1 | new rating: 1420 | ||
| Grand Prix Las Vegas 2018 (limited) (DOM limited) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 534 | Pederson, Kenneth (1500) | Lost 0-2 | -171450 |
| 2sealed | 642 | Davis, Alexander (1482) | Lost 0-2 | -181432 |
| 3sealed | 749 | Perret, Valentin (1461) | Lost 1-2 | -171415 |
| top | average opponent: 1481record: 0-3 | new rating: 1415 | ||
| Grand Prix Phoenix 2017 (XLN limited) | starting rating: 1414 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 274 | Conway, Mark (1500) | Won 2-1 | +201434 |
| 2sealed | 22 | Alyk, Justin (1518) | Lost 1-2 | -161418 |
| 3sealed | 418 | Turney, Christopher (1628) | Lost 1-2 | -151403 |
| 4sealed | 443 | Romero, Julian (1571) | Lost 1-2 | -151388 |
| 5sealed | 457 | Chelf, Ben (1474) | Won 2-1 | +201408 |
| 6sealed | 391 | Kastner, Donald (1846) | Won 2-1 | +251433 |
| 7sealed | 274 | Peck, Arthur (1674) | Won 2-0 | +231456 |
| 8sealed | 288 | Branam, Chris (1559) | Won 2-0 | +201476 |
| 9sealed | 191 | Sochurek, Petr (2054) | Lost 0-2 | -91467 |
| top | average opponent: 1647record: 5-4 | new rating: 1467 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1444 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 573 | Cook, Richard (1625) | Lost 1-2 | -141430 |
| 2sealed | 683 | Veal, Isaac (1464) | Won 2-0 | +181448 |
| 3sealed | 902 | Vanderhoof, Dustin (1561) | Draw 1-1 | +21450 |
| 4sealed | 781 | Gipson, David (1497) | Lost 1-2 | -171433 |
| 5sealed | 860 | Smethurst, Dan (1401) | Lost 1-2 | -191414 |
| top | average opponent: 1510record: 1-3-1 | new rating: 1414 | ||
| Grand Prix San Jose 2017 (AER limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 478 | Scott, Alexander (1517) | Won 2-0 | +181518 |
| 2sealed | 419 | Little, Harrison (1440) | Lost 0-2 | -191499 |
| 3sealed | 523 | Craig, Mike (1476) | Lost 1-2 | -191480 |
| 4sealed | 625 | Kutz, Sebastian (1479) | Lost 1-2 | -181462 |
| 5sealed | 782 | Hollman, Mandy (1453) | Lost 0-2 | -181444 |
| top | average opponent: 1473record: 1-4 | new rating: 1444 | ||