Mangham, Doug
Current rating: 1528
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 15 | ReCasino, Matthew (1659) | Won 2-0 | +201561 |
| 2pioneer | 26 | Davila, David (1742) | Lost 1-2 | -141547 |
| 3pioneer | 259 | Zafiropoulos, Alexander (1520) | Lost 0-2 | -191528 |
| top | average opponent: 1640record: 1-2 | new rating: 1528 | ||
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 375 | Colon, Gustavo (1534) | Lost 0-2 | -171486 |
| 2modern | 524 | Clinton, Wesley (1482) | Won 2-1 | +181504 |
| 3modern | 412 | Bach, Austin (1658) | Won 2-0 | +211525 |
| 4modern | 280 | Foreman, Garrett (1469) | Won 2-1 | +171542 |
| 5modern | 134 | Bennett, Evan (1555) | Lost 1-2 | -181524 |
| 6modern | 403 | Cameli, Todd (1429) | Won 2-0 | +161540 |
| 7modern | 338 | Lachney, Donovan (1644) | Won 2-0 | +201560 |
| 8modern | 204 | Ngo, Scott (1515) | Lost 0-2 | -191541 |
| top | average opponent: 1536record: 5-3 | new rating: 1541 | ||
| Grand Prix Oakland 2016 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 266 | Gerbozy, Martin (1500) | Won 2-1 | +181518 |
| 2standard | 108 | Johnson, Matthew (1451) | Lost 0-2 | -191499 |
| 3standard | 602 | Engelen, Mitchell (1500) | Lost 0-2 | -181481 |
| 4standard | 775 | Yap, Quinton (1465) | Won 2-1 | +181499 |
| 5standard | 680 | Bao, Kun (1488) | Won 2-1 | +171516 |
| 6standard | 485 | Irvine, David (1792) | Won 2-1 | +231539 |
| 7standard | 291 | Fisher, Zack (1582) | Lost 0-2 | -171522 |
| 8standard | 443 | Klemic, Michael (1491) | Lost 0-2 | -191503 |
| top | average opponent: 1533record: 4-4 | new rating: 1503 | ||