Costello, Michael
Current rating: 1432
| Grand Prix Orlando 2017 (AER limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 629 | Mathews, Charles (1500) | Lost 1-2 | -171448 |
| 2sealed | 997 | Windischman, Mark (1482) | Won 2-1 | +181466 |
| 3sealed | 970 | DiGirolamo, Glenn (1549) | Lost 0-2 | -161450 |
| 4sealed | 1107 | Wang, Zilu (1483) | Lost 1-2 | -181432 |
| top | average opponent: 1504record: 1-3 | new rating: 1432 | ||
| Grand Prix Indianapolis 2015 (BFZ standard) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 296 | Scott, Jimmy (1485) | Lost 0-2 | -181465 |
| top | record: 0-1 | new rating: 1465 | ||
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 402 | Zyla, Sarah (1549) | Lost 1-2 | -171483 |
| top | record: 0-1 | new rating: 1483 | ||