Underhill, Justin
Current rating: 1427
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1471 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 18 | Larsen-Scott, James (1741) | Lost 0-2 | -141457 |
| 2pioneer | 292 | Vincent, Zachary (1445) | Lost 0-2 | -181439 |
| 3pioneer | 445 | Spikes, Russell (1761) | Lost 0-2 | -121427 |
| top | average opponent: 1649record: 0-3 | new rating: 1427 | ||
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 378 | Ulano, Eddie (1500) | Won 2-0 | +181503 |
| 2modern | 373 | Rioux, Zachary (1517) | Lost 0-2 | -181485 |
| 3modern | 476 | King, Alex (1529) | Won 2-0 | +191504 |
| 4modern | 466 | Tetlow, Adam (1561) | Lost 0-2 | -171487 |
| 5modern | 609 | Arrieta, Kepa (1578) | Lost 1-2 | -161471 |
| top | average opponent: 1537record: 2-3 | new rating: 1471 | ||
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 144 | Stephenson, Brandy (1522) | Lost 0-2 | -181482 |
| 2modern | 440 | Stout, Sean (1482) | Lost 1-2 | -181464 |
| 3modern | 676 | Aune, Alex (1464) | Won 2-0 | +181482 |
| 4modern | 593 | Shields, True (1601) | Won 2-0 | +211503 |
| 5modern | 456 | Henriques, Richard (1500) | Lost 1-2 | -181485 |
| top | average opponent: 1514record: 2-3 | new rating: 1485 | ||