O'Quinn, Mark
Current rating: 1452
Record: 9-12
| Grand Prix Dallas-Fort Worth 2019 (modern) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 293 | Montijo, Jesus (1527) | Lost 1-2 | -181469 |
| 2modern | 467 | Britton, Taylor (1448) | Won 2-0 | +181487 |
| 3modern | 331 | Chacon, Daniel (1546) | Lost 1-2 | -171470 |
| 4modern | 524 | Spears, Nicholas (1540) | Lost 0-2 | -171453 |
| 5modern | 489 | Wang, Anthony (1516) | Lost 1-2 | -171436 |
| 6modern | 453 | Herdman, William (1299) | Won 2-0 | +161452 |
| top | average opponent: 1479record: 2-4 | new rating: 1452 | ||
| Grand Prix Dallas-Fort Worth 2018 (DOM limited) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 12 | Ewing, Michael (1458) | Lost 0-2 | -191486 |
| 2sealed | 302 | Schelsteder, Michael (1483) | Won 2-0 | +181504 |
| 3sealed | 421 | Hess, Tyler (1655) | Lost 0-2 | -151489 |
| 4sealed | 404 | Cobert, Michael (1364) | Lost 1-2 | -211468 |
| 5sealed | 417 | Crossley, Lacy (1465) | Won 2-0 | +181486 |
| 6sealed | 336 | Berry, Kirk (1458) | Won 2-0 | +181504 |
| 7sealed | 265 | Menchaca, Jose (1547) | Lost 0-2 | -171487 |
| top | average opponent: 1490record: 3-4 | new rating: 1487 | ||
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 5 | Clift, Hunter (1500) | Won 2-0 | +181518 |
| 2sealed | 192 | Dedrick, John (1811) | Lost 0-2 | -131505 |
| 3sealed | 285 | Fan, Mengyu (1500) | Lost 0-2 | -181487 |
| 4sealed | 353 | Goff, Parker (1488) | Lost 1-2 | -181469 |
| 5sealed | 355 | Mosher, Jason (1467) | Lost 0-2 | -181451 |
| 6sealed | 301 | Cook, Gabriel (1447) | Won 2-0 | +181469 |
| 7sealed | 241 | Threadgill, Chris (1470) | Won 2-1 | +181487 |
| 8sealed | 191 | Pasfield, Christian (1480) | Won 2-0 | +181505 |
| top | average opponent: 1520record: 4-4 | new rating: 1505 | ||