Portello, James
Current rating: 1358
Record: 12-23-2
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1374 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 121 | Nelson, Timothy (1500) | Lost 0-2 | -161358 |
| top | record: 0-1 | new rating: 1358 | ||
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1383 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 384 | Ansel, Aj (1500) | Lost 1-2 | -161367 |
| 2modern | 477 | Rice, Paul (1523) | Won 2-0 | +211388 |
| 3modern | 643 | Enns, Galen (1417) | Draw 1-1 | +11389 |
| 4modern | 1210 | Saltsman, David (1576) | Lost 1-2 | -151374 |
| top | average opponent: 1504record: 1-2-1 | new rating: 1374 | ||
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 209 | Cobler, Tim (1446) | Lost 1-2 | -181415 |
| 2modern | 546 | Ballesteros, Jose (1480) | Won 2-1 | +191434 |
| 3modern | 479 | Garcia, Anthony (1427) | Lost 1-2 | -181416 |
| 4modern | 695 | Ahmad, Sam (1530) | Lost 0-2 | -161400 |
| 5modern | 664 | Bomgardner, Zachery (1428) | Won 2-0 | +181418 |
| 6modern | 512 | Guo, Michelle (1271) | Lost 1-2 | -201398 |
| 7modern | 439 | Shaw, Andrew (1581) | Lost 0-2 | -151383 |
| top | average opponent: 1452record: 2-5 | new rating: 1383 | ||
| Grand Prix Las Vegas 2018 (modern) (modern) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1336 | Foster, Reigh (1505) | Lost 0-2 | -171450 |
| 2modern | 784 | Donathan, Matthew (1481) | Lost 0-2 | -171433 |
| top | average opponent: 1493record: 0-2 | new rating: 1433 | ||
| Grand Prix Phoenix 2017 (XLN limited) | starting rating: 1439 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 157 | Fish, Robby (1500) | Won 2-0 | +191458 |
| 2sealed | 241 | Tran, Viet (1783) | Won 2-0 | +241482 |
| 3sealed | 34 | Hallock, Jason (1623) | Won 2-0 | +201502 |
| 4sealed | 103 | Skarren, Frank (1989) | Lost 0-2 | -101492 |
| 5sealed | 85 | Weis, Kevin (1541) | Draw 1-1 | +11493 |
| 6sealed | 172 | Pace, Stanley (1571) | Lost 0-2 | -161477 |
| 7sealed | 260 | Van Cleave, Trey (1991) | Lost 1-2 | -101467 |
| top | average opponent: 1714record: 3-3-1 | new rating: 1467 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 353 | Moore, Morgan (1500) | Lost 0-2 | -171430 |
| 2sealed | 693 | White, Scott (1489) | Lost 1-2 | -171413 |
| 3sealed | 1040 | Olaveson, James (1460) | Won 2-0 | +191432 |
| 4sealed | 905 | Guggemos, Jim (1491) | Won 2-1 | +191451 |
| 5sealed | 748 | Nguyen, Thanh (1577) | Lost 1-2 | -161435 |
| 6sealed | 736 | Stachurski, Richard (1647) | Won 2-0 | +221457 |
| 7sealed | 689 | Boehme, Victoria (1442) | Lost 0-2 | -181439 |
| top | average opponent: 1515record: 3-4 | new rating: 1439 | ||
| Grand Prix Phoenix 2014 (BNG standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 210 | Benke, Joseph (1500) | Won 2-0 | +181518 |
| 2standard | 192 | Rogers, John (1465) | Won 2-1 | +171535 |
| 3standard | 121 | Lamparter, Daniel (1573) | Lost 1-2 | -171518 |
| 4standard | 317 | Belknap, Randy (1533) | Lost 0-2 | -181500 |
| 5standard | 451 | Chreptyk, Brandon (1705) | Lost 0-2 | -141486 |
| 6standard | 473 | Thatcher, Tyson (1422) | Won 2-0 | +171503 |
| 7standard | 383 | Cornellier, Aaron (1466) | Lost 1-2 | -191484 |
| 8standard | 318 | Hickey, Bryan (1434) | Lost 1-2 | -191465 |
| 9standard | 58 | Evans, Dylun (1464) | Lost 1-2 | -181447 |
| top | average opponent: 1507record: 3-6 | new rating: 1447 | ||