Dematteo, Matthew
Current rating: 1452
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 468 | Belanger, Kyle (1500) | Won 2-0 | +191486 |
| 2sealed | 562 | Morrill, Alex (1537) | Won 2-0 | +191505 |
| 3sealed | 433 | Ronquillo, Voltaire (1518) | Lost 0-2 | -181487 |
| 4sealed | 547 | Bourque, Jason (1517) | Lost 0-2 | -181469 |
| 5sealed | 626 | Brown, Skyler J (1500) | Lost 0-2 | -171452 |
| top | average opponent: 1514record: 2-3 | new rating: 1452 | ||
| Grand Prix New Jersey 2004 (Mirrodin block) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 263 | Jargowsky, Bill (1500) | Lost 1-2 | -181466 |
| 2block | 252 | Watts, Jay (1482) | Won 2-1 | +181484 |
| 3block | 263 | Rodroguez, Eric (1500) | Won 2-0 | +181502 |
| 4block | 218 | Wilson, Brent (1519) | Lost 1-2 | -171485 |
| 5block | 219 | Giaquinto, Frank (1503) | Lost 1-2 | -181467 |
| top | average opponent: 1501record: 2-3 | new rating: 1467 | ||
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 216 | Fiorillo, John (1568) | Won 2-1 | +191519 |
| 2sealed | 45 | Branan, Herbert (1489) | Won 2-0 | +181537 |
| 3sealed | 54 | Gravlin, Andrew (1574) | Lost 1-2 | -181519 |
| 4sealed | 138 | Punzalan, Raymond (1519) | Won 2-1 | +181537 |
| 5sealed | 77 | Smith, Dan (1557) | Lost 0-2 | -171520 |
| 6sealed | 156 | Hoogland, Brandon (1518) | Lost 1-2 | -181502 |
| 7sealed | 187 | Kosier, Adam (1495) | Lost 0-2 | -181484 |
| top | average opponent: 1531record: 3-4 | new rating: 1484 | ||