O'Halloran, John
Current rating: 1487
Record: 6-7
| Grand Prix Miami 2015 (FRF standard) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 270 | Matecki, Justin (1473) | Lost 0-2 | -191483 |
| 3standard | 482 | Wyant, Aaron (1629) | Won 2-0 | +211504 |
| 4standard | 198 | Dowling, Vincent (1518) | Won 2-1 | +181522 |
| 5standard | 106 | Roger, Philippe (1545) | Lost 0-2 | -181504 |
| 6standard | 370 | Smith, Warren (1550) | Lost 1-2 | -171487 |
| average opponent: 1543record: 2-3 | new rating: 1487 | |||
| Grand Prix Miami 2013 (DGM standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 329 | Delamotta, Dwayne A (1500) | Lost 1-2 | -181482 |
| 2standard | 348 | LaMendola, Joseph (1481) | Lost 1-2 | -181464 |
| 3standard | 462 | Perry, Corey (1466) | Won 2-0 | +181482 |
| 4standard | 442 | Giguere, Anthony (1481) | Won 2-1 | +181500 |
| 5standard | 363 | Binsky, Joshua (1449) | Won 2-0 | +171517 |
| 6standard | 276 | Ayers, Patrick (1521) | Lost 0-2 | -181499 |
| 7standard | 311 | Russell, Matthew (1559) | Won 2-1 | +191518 |
| 8standard | 204 | Hord, Chad (1595) | Lost 1-2 | -161502 |
| average opponent: 1506record: 4-4 | new rating: 1502 | |||