Massey, Sebastian
Current rating: 1461
| Grand Prix Las Vegas 2013 (MMA limited) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1234 | Adajar, Christopher (1486) | Won 2-1 | +181498 |
| 2sealed | 1370 | Cejas, Jose Adolfo (1500) | Lost 0-2 | -181480 |
| 3sealed | 1285 | Le, Steven (1503) | Lost 0-2 | -181462 |
| 4sealed | 1309 | Miller, Daniel (1481) | Won 2-0 | +181480 |
| 5sealed | 935 | Nguyen, Philip (1426) | Lost 1-2 | -191461 |
| top | average opponent: 1479record: 2-3 | new rating: 1461 | ||
| Grand Prix Toronto 2010 (SOM limited) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 365 | Cudlip, Alan (1500) | Won 2-0 | +191465 |
| 2sealed | 383 | Dio, Michael V (1557) | Won 2-0 | +201485 |
| 3sealed | 389 | Wauer, Carl (1667) | Won 2-1 | +211506 |
| 4sealed | 380 | O'Brien, Andrew (1490) | Lost 0-2 | -181488 |
| 5sealed | 431 | Canode, Alan R (1613) | Won 2-0 | +201508 |
| 6sealed | 348 | Sperling, Matthew (1952) | Lost 0-2 | -101498 |
| 7sealed | 404 | Clarke, Davies (1474) | Lost 1-2 | -181480 |
| top | average opponent: 1607record: 4-3 | new rating: 1480 | ||
| Grand Prix Boston 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 66 | Trudeau, Joshua (1529) | Lost 1-2 | -171483 |
| 2extended | 238 | Gillam, Tim (1480) | Lost 0-2 | -191464 |
| 3extended | 279 | Paruntu, Yohanes (1464) | Lost 0-2 | -181446 |
| top | average opponent: 1491record: 0-3 | new rating: 1446 | ||