Costello, Alexander
Current rating: 1570
Record: 39-40
| Grand Prix New Jersey 2020 (THB limited) | starting rating: 1540 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 81 | Martin, Alex (1590) | Won 2-1 | +191559 |
| 3sealed | 194 | Bristoll, Louis (1443) | Won 2-1 | +161575 |
| 4sealed | 104 | Kwon, John (1565) | Lost 0-2 | -181557 |
| 5sealed | 249 | Shaffer, Joe (1539) | Won 2-1 | +181575 |
| 6sealed | 180 | Turnbull, Chris (1694) | Won 2-0 | +201595 |
| 7sealed | 60 | Neal, Stephen (1920) | Lost 0-2 | -131582 |
| 8sealed | 140 | Fabiano, Gerard (1918) | Lost 0-2 | -121570 |
| top | average opponent: 1667record: 4-3 | new rating: 1570 | ||
| Grand Prix Washington DC 2019 (MH1 limited) | starting rating: 1595 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 126 | Ma, Xiaozhe (1707) | Lost 0-0 | -161579 |
| 3sealed | 291 | Weller, Rachel (1519) | Lost 1-2 | -191560 |
| 4sealed | 455 | Corbin, Julia (1482) | Lost 1-2 | -201540 |
| top | average opponent: 1569record: 0-3 | new rating: 1540 | ||
| Grand Prix Cleveland 2019 (RNA limited) | starting rating: 1594 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 69 | Jones, Kevin (1984) | Won 2-1 | +251619 |
| 4sealed | 172 | Nicolas, Victor (1830) | Lost 0-2 | -141605 |
| 5sealed | 196 | Neris, Jose (1909) | Won 2-0 | +231628 |
| 6sealed | 93 | Miller, John 1497 (1558) | Lost 1-2 | -191609 |
| 7sealed | 148 | Mata, Andrew (1812) | Lost 0-2 | -141595 |
| top | average opponent: 1819record: 2-3 | new rating: 1595 | ||
| Grand Prix New Jersey 2019 (RNA limited) | starting rating: 1638 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 324 | Gallen, Derek (1563) | Lost 0-2 | -191619 |
| 4sealed | 465 | Sanders, Benjamin (1499) | Won 2-0 | +151634 |
| 5sealed | 148 | Kelly, Frank (1537) | Lost 1-2 | -191615 |
| 6sealed | 251 | Dooling, Matthew (1499) | Lost 1-2 | -211594 |
| top | average opponent: 1525record: 1-3 | new rating: 1594 | ||
| Grand Prix New Jersey 2018 (GRN standard) | starting rating: 1643 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 125 | Radovic, Sava (1538) | Won 2-0 | +161659 |
| 4standard | 77 | Yao, Zile (1742) | Lost 1-2 | -161643 |
| 5standard | 228 | Hahn, Albert (1555) | Lost 0-2 | -201623 |
| 6standard | 350 | Featherer, Jacob (1581) | Won 2-1 | +181641 |
| 7standard | 225 | Hepfer, Corey (1535) | Lost 0-2 | -201621 |
| 8standard | 269 | Hughes, Shawn (1577) | Won 2-0 | +171638 |
| top | average opponent: 1588record: 3-3 | new rating: 1638 | ||
| Grand Prix Hartford 2018 (modern) | starting rating: 1577 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 266 | Burke, Tyler (1537) | Won 2-1 | +171594 |
| 4modern | 61 | Anderson, Andrew (1573) | Won 2-1 | +181612 |
| 5modern | 31 | Jagos, Michael (1576) | Won 2-1 | +171629 |
| 6modern | 39 | Pastore, Kellen (1952) | Lost 1-2 | -121617 |
| 7modern | 115 | Rowe, Sean (1525) | Won 2-1 | +161633 |
| 8modern | 71 | Lee, Robert 724 (1704) | Lost 1-2 | -171616 |
| 9modern | 281 | McGowen, Ryan (1543) | Lost 0-2 | -191597 |
| 10modern | 332 | Schmidt, Steven (1540) | Won 2-1 | +171614 |
| 11modern | 281 | Ingram, Michael (1633) | Lost 1-2 | -181596 |
| 12modern | 333 | Mullen, Collins (1740) | Won 2-1 | +211617 |
| 13modern | 307 | Razzaboni, Mark (1644) | Won 2-1 | +191636 |
| 14modern | 269 | Rong, Kei (1746) | Won 2-1 | +201656 |
| 15modern | 248 | Martinez, Mario E (1987) | Lost 1-2 | -131643 |
| top | average opponent: 1669record: 8-5 | new rating: 1643 | ||
| Grand Prix New Jersey 2017 (lim) (XLN limited) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 297 | Della Grotte, Kevin (1406) | Won 2-1 | +161519 |
| 2sealed | 25 | Sorace, Joe (1519) | Won 2-0 | +181537 |
| 3sealed | 43 | McCaffery, Joseph (1535) | Lost 0-2 | -181519 |
| 4sealed | 292 | Ross, T. Scott (1517) | Won 2-1 | +181537 |
| 5sealed | 247 | Seder, Robert (1791) | Won 2-0 | +221559 |
| 6sealed | 147 | Flinn, Ian (1405) | Won 2-1 | +161575 |
| 7sealed | 92 | Baraniecki, Michael (1883) | Won 2-0 | +231598 |
| 8sealed | 31 | Falcioni, Matthew (1900) | Lost 0-2 | -131585 |
| 9sealed | 101 | Cerbone, Alex (1676) | Lost 0-2 | -161569 |
| 10draft | 97 | Fellows, Gage (1564) | Won 2-1 | +181587 |
| 11draft | 160 | Izsak, Gabby (1738) | Lost 0-2 | -151572 |
| 12draft | 119 | Carmi, Oded (1570) | Lost 0-2 | -181554 |
| 13draft | 124 | Singer, Jared (1707) | Won 2-1 | +201574 |
| 14draft | 128 | Roth, Marcus (1675) | Lost 0-2 | -161558 |
| 15draft | 74 | Kelly, Jeff (1595) | Won 2-1 | +191577 |
| top | average opponent: 1632record: 9-6 | new rating: 1577 | ||
| Grand Prix Washington DC 2017 (HOU standard) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 309 | Miller, John (1432) | Won 2-1 | +171495 |
| 2standard | 2 | Puryear, Benjamin (1518) | Lost 1-2 | -171478 |
| 3standard | 586 | Grove, Garth (1499) | Lost 1-2 | -181460 |
| 4standard | 574 | Hayman, Maria (1482) | Lost 0-2 | -171443 |
| 5standard | 633 | Haney, Shanna (1466) | Won 2-1 | +181461 |
| 6standard | 500 | Chase, John (1587) | Won 2-0 | +201481 |
| 7standard | 441 | Yam, Philip (1781) | Won 2-1 | +241505 |
| 8standard | 261 | Klar, Seth (1516) | Won 2-1 | +181523 |
| 9standard | 319 | Rubin, Steve (2115) | Won 2-1 | +271550 |
| 10standard | 180 | Hymel, Eric (1726) | Lost 1-2 | -141536 |
| 11standard | 191 | Clement, Joseph (1573) | Won 2-0 | +181554 |
| 12standard | 188 | Johnson, Case (1730) | Lost 1-2 | -151539 |
| 13standard | 177 | White, Eli (1496) | Lost 0-2 | -181521 |
| 14standard | 162 | Villena, Bret (1520) | Lost 0-2 | -181503 |
| top | average opponent: 1603record: 7-7 | new rating: 1503 | ||
| Grand Prix Richmond 2017 (AKH limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 390 | Kim, Da-Me (1461) | Lost 0-2 | -171428 |
| 2sealed | 421 | Bower, Mac (1639) | Lost 1-2 | -141414 |
| 3sealed | 735 | D'Agostino, Kris (1419) | Won 2-1 | +181432 |
| 4sealed | 690 | Emerson Jr, Brian (1492) | Won 2-0 | +191451 |
| 5sealed | 480 | Feldman, Joshua (1539) | Lost 0-2 | -171434 |
| 6sealed | 552 | Cravens, Matthew (1485) | Won 2-0 | +191453 |
| 7sealed | 395 | Frias, Marc (1567) | Won 2-0 | +201473 |
| 8sealed | 289 | Oleyourryk, Matthew (1433) | Won 2-0 | +181491 |
| 9sealed | 221 | Anderson, Ben (1805) | Lost 0-2 | -131478 |
| top | average opponent: 1538record: 5-4 | new rating: 1478 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 382 | Richardson, Adam (1500) | Lost 1-2 | -181482 |
| 2modern | 446 | Porcaro, Peter (1449) | Lost 0-2 | -191463 |
| 3modern | 544 | Dimartino, Anthony (1467) | Lost 0-2 | -181445 |
| top | average opponent: 1472record: 0-3 | new rating: 1445 | ||