Costello, James
Current rating: 1663
Record: 22-13-2
| Grand Prix Indianapolis 2016 (modern) | starting rating: 1580 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 106 | Riddell, Barry (1475) | Won 2-1 | +161596 |
| 2modern | 87 | Ritchey, David (1509) | Lost 0-2 | -201576 |
| 3modern | 538 | Crawford, Dakota (1502) | Lost 0-2 | -191557 |
| 4modern | 872 | Johnson, Anthony (1426) | Won 2-1 | +151572 |
| 5modern | 472 | Ness, Trenton (1502) | Won 2-0 | +171589 |
| 6modern | 514 | Berman, Hunter (1561) | Won 2-1 | +181607 |
| 7modern | 364 | Houston, Zane (1608) | Won 2-0 | +181625 |
| 8modern | 184 | Flaherty, Willie (1555) | Lost 1-2 | -201605 |
| 9modern | 365 | Neal, Clint (1486) | Won 2-0 | +161621 |
| 10modern | 1081 | Gunn, Taylor (1608) | Won 2-1 | +181639 |
| 11modern | 978 | Hoffman, Eric (1576) | Won 2-1 | +171656 |
| 12modern | 879 | Sittner, Alex (1990) | Won 2-0 | +241680 |
| 13modern | 904 | Linneman, Ryan (1595) | Draw 1-1 | -21678 |
| 14modern | 891 | Cravens, Josh (1636) | Draw 1-1 | -11677 |
| 15modern | 928 | Bartley, Matthew (1884) | Lost 0-2 | -141663 |
| top | average opponent: 1594record: 9-4-2 | new rating: 1663 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1552 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 324 | Bull, Robert (1514) | Lost 0-2 | -191533 |
| 2modern | 474 | Folk, Chris (1558) | Won 2-0 | +191552 |
| 3modern | 352 | Dean, Declan (1446) | Won 2-0 | +161568 |
| 4modern | 282 | O'Neill, Alex (1427) | Won 2-0 | +151583 |
| 5modern | 174 | Fischer, RJ (1427) | Won 2-1 | +161599 |
| 6modern | 136 | Dame, David (1590) | Lost 0-2 | -191580 |
| 7modern | 140 | Wetherald, Dylan (1533) | Won 2-0 | +181598 |
| 8modern | 80 | Ouimet, Guillaume (1606) | Lost 1-2 | -181580 |
| top | average opponent: 1513record: 5-3 | new rating: 1580 | ||
| Grand Prix Minneapolis 2014 (modern) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 150 | Moscatel, Matthew (1597) | Won 2-1 | +191569 |
| 4modern | 131 | Danielson, Eben (1554) | Won 2-1 | +181587 |
| 5modern | 163 | Babbitt, Nicolas (1577) | Lost 0-2 | -181569 |
| 6modern | 165 | Ledy, Lawrence (1613) | Lost 1-2 | -181551 |
| 7modern | 296 | Whipple, Cameron (1541) | Won 2-1 | +181569 |
| 8modern | 208 | Wilks, James (1614) | Lost 0-2 | -171552 |
| top | average opponent: 1583record: 3-3 | new rating: 1552 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 48 | Mannion, Cody (1524) | Won 2-1 | +181518 |
| 3sealed | 81 | Davis, Robb (1729) | Won 2-1 | +221540 |
| 4sealed | 74 | Manfield, Seth (1907) | Lost 0-2 | -111529 |
| 5sealed | 100 | Vallies, Matt (1534) | Won 2-1 | +181547 |
| 6sealed | 53 | Sharkey, Andrew (1557) | Won 2-0 | +181565 |
| 7sealed | 47 | Choma, Tom (1674) | Won 2-1 | +201585 |
| 8sealed | 19 | Skolnik, Yoni (1704) | Lost 1-2 | -161569 |
| 9sealed | 61 | Pease, Nate (1526) | Lost 1-2 | -191550 |
| top | average opponent: 1644record: 5-3 | new rating: 1550 | ||