Costello, Spencer
Current rating: 1274
Record: 6-21-3
| Grand Prix Los Angeles 2018 (M19 standard) | starting rating: 1325 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 54 | Vanderpool, Hurley (1429) | Lost 0-2 | -161309 |
| 2standard | 289 | Weinstein, Zachary (1368) | Lost 1-2 | -171292 |
| 3standard | 485 | Steinmetz, Kegan (1460) | Lost 0-2 | -151277 |
| 4standard | 496 | Wenger, Jacob (1446) | Won 2-1 | +211298 |
| 5standard | 453 | McCarthy, Jarrad (1467) | Lost 1-2 | -151283 |
| 6standard | 396 | Rockey, Garrett (1450) | Lost 0-1 | -151268 |
| 7standard | 341 | Siegel, Amavri (1425) | Draw 1-1 | +31271 |
| 8standard | 284 | Rosa, Byron (1450) | Draw 1-1 | +31274 |
| top | average opponent: 1437record: 1-5-2 | new rating: 1274 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1368 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 597 | Cheredaryk, Blair (1456) | Won 2-0 | +191387 |
| 2standard | 67 | Wertzbaugher, Clinton (1503) | Draw 1-1 | +31390 |
| 3standard | 290 | Pierce, Daniel (1438) | Lost 0-2 | -181372 |
| 4standard | 479 | Michelet, Trystan (1460) | Lost 0-2 | -161356 |
| 5standard | 613 | Bergstrom, Taylor (1482) | Lost 0-2 | -161340 |
| 6standard | 659 | Connelly, Joseph (1470) | Lost 0-2 | -151325 |
| top | average opponent: 1468record: 1-4-1 | new rating: 1325 | ||
| Grand Prix San Jose 2017 (AER limited) | starting rating: 1391 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 683 | Kutz, Sebastian (1500) | Lost 0-2 | -161375 |
| 2sealed | 631 | Martin, Mick (1483) | Won 2-1 | +201395 |
| 3sealed | 405 | Moen, Chris (1429) | Won 2-1 | +191414 |
| 4sealed | 324 | Ostrow, Elijah (1519) | Won 2-1 | +201434 |
| 5sealed | 331 | Chow, Harold (1459) | Lost 0-2 | -181416 |
| 6sealed | 312 | McClain, Ian (1526) | Lost 0-2 | -161400 |
| 7sealed | 454 | Mick, Joel (1503) | Lost 0-2 | -161384 |
| 8sealed | 515 | Castelo Viosca, Arturo (1472) | Lost 0-2 | -161368 |
| top | average opponent: 1486record: 3-5 | new rating: 1368 | ||
| Grand Prix Oakland 2016 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 140 | Doyle, Bailey (1460) | Lost 0-2 | -191481 |
| 2standard | 686 | Kiyonaga, Adam (1482) | Lost 0-2 | -181463 |
| 3standard | 843 | Mizzoni, Joel (1464) | Lost 0-2 | -181445 |
| 4standard | 864 | Bertrand, Ashley (1448) | Lost 1-2 | -181427 |
| 5standard | 840 | Godlove, Adam (1430) | Lost 0-2 | -181409 |
| 6standard | 770 | G'Acha, Max (1416) | Won 2-0 | +181427 |
| 7standard | 679 | Teves, Justin (1428) | Lost 0-2 | -171410 |
| 8standard | 570 | Poczulp, Gina (1409) | Lost 0-2 | -191391 |
| top | average opponent: 1442record: 1-7 | new rating: 1391 | ||