Duffey, Michael
Current rating: 1457
| Grand Prix Las Vegas 2013 (MMA limited) | starting rating: 1457 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1193 | Duhame, Henry (1500) | Draw 0-0 | 01457 |
| top | record: 0-0-1 | new rating: 1457 | ||
| Grand Prix Portland 2010 (M11 limited) | starting rating: 1490 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 397 | Pavelchak, Drew (1500) | Won 2-0 | +191509 |
| 2sealed | 147 | Fung, Jeff (1634) | Lost 1-2 | -161493 |
| 3sealed | 388 | Conway, Zach (1499) | Lost 1-2 | -181475 |
| 4sealed | 470 | Ruppert, James (1462) | Lost 0-2 | -181457 |
| top | average opponent: 1524record: 1-3 | new rating: 1457 | ||
| Grand Prix San Francisco 2007 (Time Spiral block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 154 | Dickerson, Adam (1517) | Won 2-0 | +181518 |
| 3block | 94 | Goddard, Maxwell (1426) | Won 2-0 | +171535 |
| 4block | 51 | Ruel, Olivier (2154) | Lost 0-2 | -81527 |
| 5block | 103 | Rider, Brian (1502) | Lost 0-2 | -191508 |
| 6block | 111 | Kossman, Matthew (1518) | Lost 0-2 | -181490 |
| top | average opponent: 1623record: 2-3 | new rating: 1490 | ||