Petterson, John
Current rating: 1542
Record: 14-15 (GP) / 4-4 (professional)
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 111 | McCusker, Jerrod (1518) | Won 2-0 | +191520 |
| 4sealed | 110 | Makino, Bernie (1530) | Won 2-0 | +181538 |
| 5sealed | 32 | Ochoa, David (1893) | Lost 1-2 | -121526 |
| 6sealed | 50 | Herberholz, Mark (1756) | Lost 0-2 | -141512 |
| 7sealed | 159 | Cook, Nick (1544) | Won 2-0 | +191531 |
| 8sealed | 95 | Stark, Ben S (2068) | Won 2-1 | +271558 |
| 9sealed | 64 | Germar, Richard (1669) | Lost 0-2 | -161542 |
| top | average opponent: 1711record: 4-3 | new rating: 1542 | ||
| Pro Tour Nagoya 2011 (Scars block) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 63 | Chiba, Akio (1892) | Won 2-0 | +251497 |
| 2block | 84 | Lee, Jay (1554) | Lost 0-2 | -171480 |
| 3block | 86 | Shiraishi, Ryou (1535) | Won 2-0 | +191499 |
| 4block | 34 | Stark, Ben S (2042) | Lost 0-2 | -91490 |
| 5block | 77 | Passow, Christopher (1485) | Won 2-1 | +181508 |
| 6draft | 32 | Melis, Bas (1877) | Lost 1-2 | -121496 |
| 7draft | 56 | Marshall, David (1513) | Lost 0-2 | -171479 |
| 8draft | 125 | Shenhar, Shahar (1729) | Won 2-0 | +221501 |
| top | average opponent: 1703record: 4-4 | new rating: 1501 | ||
| Grand Prix Columbus 2010 (legacy) | starting rating: 1508 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 129 | Bunn, Thomas S (1500) | Lost 1-2 | -181490 |
| 3legacy | 142 | Manzano, Steve L (1500) | Lost 1-2 | -181472 |
| top | average opponent: 1500record: 0-2 | new rating: 1472 | ||
| Grand Prix Kansas City 2008 (ALA limited) | starting rating: 1529 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 184 | Stachurski, Richard (1578) | Won 2-0 | +191548 |
| 3sealed | 100 | Gruneich, Timothy (1570) | Lost 0-2 | -181530 |
| 4sealed | 137 | Morath, Nation S (1487) | Won 2-0 | +171547 |
| 5sealed | 61 | Lipp, Scott (1474) | Lost 0-2 | -191528 |
| 6sealed | 147 | Bramlett, Nathan (1401) | Lost 1-2 | -201508 |
| top | average opponent: 1502record: 2-3 | new rating: 1508 | ||
| Grand Prix Denver 2008 (Lorwyn block) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 3block | 64 | Sittner, Jeff (1526) | Won 2-0 | +181552 |
| 4block | 27 | Kibler, Brian (1830) | Lost 1-2 | -131539 |
| 5block | 66 | Juarez, Chad (1474) | Won 2-1 | +161555 |
| 6block | 25 | Davis, Scott (1643) | Won 2-0 | +201575 |
| 7block | 30 | Damo da Rosa, Paulo Vitor (2057) | Lost 1-2 | -101565 |
| 8block | 62 | Bessey, Stan (1512) | Lost 1-2 | -191546 |
| 9block | 81 | Garver, Leo (1587) | Lost 1-2 | -171529 |
| top | average opponent: 1661record: 3-4 | new rating: 1529 | ||
| Grand Prix St. Louis 2006 (CSP limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 78 | Strutz, David K (1500) | Won 2-1 | +181518 |
| 2sealed | 52 | Ellis, Brian (1518) | Lost 0-2 | -181500 |
| 3sealed | 105 | Daniels, Brendan M (1418) | Lost 1-2 | -191481 |
| 4sealed | 170 | Vlahovich, Heather J (1484) | Won 2-1 | +181499 |
| 5sealed | 123 | Edwards, Susan (1458) | Won 2-0 | +171516 |
| 6sealed | 113 | Varner, John (1504) | Won 2-0 | +181534 |
| 7sealed | 55 | Gent, Daniel L (1536) | Lost 0-2 | -181516 |
| 8sealed | 69 | Forster, Scott A (1518) | Won 2-0 | +181534 |
| top | average opponent: 1492record: 5-3 | new rating: 1534 | ||