Costello, Mike
Current rating: 1484
Record: 15-16-1
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 320 | Budrow, Jeremy (1500) | Won 2-1 | +181518 |
| 2standard | 171 | Lanigan, Mike (1720) | Lost 0-2 | -141504 |
| 3standard | 251 | Peotter, Eric (1501) | Won 2-1 | +181522 |
| 4standard | 221 | Krzys, Kodie (1517) | Lost 0-2 | -181504 |
| 5standard | 302 | James, Christopher (1499) | Won 0-0 | +181522 |
| 6standard | 260 | Peebles, Corey (1536) | Lost 1-2 | -181504 |
| 7standard | 241 | Brock, Jerry (1508) | Won 2-0 | +181522 |
| 8standard | 151 | Dougherty, Kyle (1502) | Lost 1-2 | -181504 |
| 9standard | 143 | Campbell, Erin (1406) | Lost 0-2 | -201484 |
| top | average opponent: 1521record: 4-5 | new rating: 1484 | ||
| Grand Prix Indianapolis 2013 (RTR limited) | starting rating: 1539 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 172 | Man, Joseph B (1500) | Lost 0-2 | -181521 |
| 2sealed | 288 | Wolfe, Jeff (1482) | Won 2-0 | +171538 |
| 3sealed | 208 | Unger, Zach (1499) | Lost 0-2 | -191519 |
| 4sealed | 291 | Webster, Billy (1537) | Lost 0-2 | -171502 |
| 5sealed | 320 | Christerson, Sebastian (1466) | Lost 1-2 | -191483 |
| 6sealed | 291 | Guyton, Quinton (1448) | Won 2-0 | +171500 |
| top | average opponent: 1488record: 2-4 | new rating: 1500 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 265 | Eickhoff, Jon (1465) | Won 2-0 | +181517 |
| 2modern | 3 | Landree, Joshua (1518) | Won 2-1 | +181535 |
| 3modern | 53 | Anaya, Tim J (1535) | Won 2-0 | +181553 |
| 4modern | 91 | Panknin, Jason (1554) | Won 2-1 | +181571 |
| 5modern | 49 | Wescoe, Craig (1908) | Lost 0-2 | -121559 |
| 6modern | 86 | Sanchez, Nick (1491) | Lost 1-2 | -201539 |
| 7modern | 182 | Forte, Nathan (1526) | Lost 0-2 | -181521 |
| 8modern | 220 | Elcock, Matthew (1537) | Won 2-0 | +181539 |
| top | average opponent: 1567record: 5-3 | new rating: 1539 | ||
| Grand Prix Indianapolis 2012 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 165 | Lavender, Ben (1464) | Lost 1-2 | -191481 |
| 2legacy | 355 | Behrens, Drew M (1486) | Lost 1-2 | -181463 |
| 3legacy | 508 | Beausoleil, Trevor (1438) | Won 2-0 | +181481 |
| 4legacy | 480 | Langford, Matthew C (1543) | Lost 1-2 | -171464 |
| 5legacy | 483 | Kloster, Kyle A (1472) | Draw 1-1 | 01464 |
| 6legacy | 452 | Hill, Austin J (1450) | Lost 0-2 | -181446 |
| 7legacy | 394 | Butts, Joshua D (1426) | Won 2-0 | +181464 |
| 8legacy | 304 | Simpson, Sarah L (1462) | Won 2-0 | +181482 |
| 9legacy | 232 | Brokaw, Andrew D (1469) | Won 1-0 | +171499 |
| top | average opponent: 1468record: 4-4-1 | new rating: 1499 | ||