Sebastian, Joshua
Current rating: 1587
Record: 22-16
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1593 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 392 | Yoshimura, Tasuke (1500) | Won 2-0 | +161609 |
| 2sealed | 211 | Tanaka, Yasuhiro (1670) | Won 2-1 | +191628 |
| 3sealed | 472 | Zhang, Qihan (1474) | Won 2-0 | +151643 |
| 4sealed | 266 | Oikawa, Hakudou (1724) | Won 2-1 | +201663 |
| 5sealed | 115 | Miura, Ryuji (1773) | Lost 0-2 | -161647 |
| 6sealed | 97 | Jono, Rei (1536) | Won 2-0 | +161663 |
| 7sealed | 78 | Ozawa, Kensuke (1640) | Lost 1-2 | -191644 |
| 8sealed | 245 | Sakuma, Takamichi (1442) | Won 2-0 | +151659 |
| 9sealed | 128 | Hashimoto, Ryota (1619) | Won 2-1 | +171676 |
| 10draft | 119 | Takesue, Chikara (1777) | Lost 0-2 | -161660 |
| 11draft | 198 | Chino, Takayuki (1566) | Lost 1-2 | -201640 |
| 12draft | 158 | Mizuno, Masahito (1492) | Lost 1-2 | -211619 |
| 13draft | 137 | Nagao, Yasutaka (1762) | Lost 0-2 | -151604 |
| 14draft | 183 | Yang, Eunje (1649) | Lost 1-2 | -171587 |
| top | average opponent: 1616record: 7-7 | new rating: 1587 | ||
| Grand Prix Denver 2017 (HOU standard) | starting rating: 1567 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 286 | Heule III, Richard (1428) | Lost 1-2 | -201547 |
| 2standard | 436 | Miller, Adam (1406) | Lost 0-2 | -211526 |
| 3standard | 489 | Rivera, Antonio (1409) | Won 2-0 | +161542 |
| 4standard | 506 | Oguma, Rory (1388) | Won 2-1 | +151557 |
| 5standard | 303 | Miller, Michael (1592) | Won 2-0 | +191576 |
| 6standard | 210 | Stott, Dylan (1713) | Won 2-1 | +201596 |
| 7standard | 139 | Sommerville, Steve (1521) | Won 2-0 | +171613 |
| 8standard | 66 | Buchanan, Drew (1442) | Lost 1-2 | -211592 |
| 9standard | 170 | Troiano, Francesco (1669) | Won 2-1 | +191611 |
| 10standard | 115 | Johnson, Chadd (1576) | Lost 0-2 | -181593 |
| top | average opponent: 1514record: 6-4 | new rating: 1593 | ||
| Grand Prix Tampa 2009 (ZEN limited) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 22 | Jones, Justin (1557) | Won 2-0 | +171588 |
| 2sealed | 37 | Miller, Casey 2 (1520) | Won 2-1 | +171605 |
| 3sealed | 47 | Gosche, Matt (1619) | Lost 0-2 | -181587 |
| 4sealed | 198 | Gracia, Jason (1534) | Won 2-1 | +171604 |
| 5sealed | 172 | Sadin, Steven (1602) | Lost 0-2 | -181586 |
| 6sealed | 225 | Huber, Kellen (1519) | Lost 1-2 | -191567 |
| top | average opponent: 1559record: 3-3 | new rating: 1567 | ||
| Grand Prix Orlando 2004 (Mirrodin block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 165 | England, Matthew (1500) | Lost 1-2 | -181482 |
| 2block | 154 | Mc Carthy, Chad (1482) | Won 2-0 | +181500 |
| 3block | 101 | Capalbo, Robert (1501) | Won 2-1 | +181518 |
| 4block | 126 | Holland, Kitt (1518) | Lost 0-2 | -181500 |
| 5block | 144 | Lewis, James (1499) | Won 2-0 | +181518 |
| 6block | 100 | Pacheco, Manuel (1494) | Won 2-1 | +181536 |
| 7block | 62 | Lieu, Andrew (1535) | Won 2-0 | +181554 |
| 8block | 56 | Antunes, Robert (1505) | Won 2-1 | +171571 |
| top | average opponent: 1504record: 6-2 | new rating: 1571 | ||