Seifert, Jeff
Current rating: 1433
Record: 27-32-2 (GP) / 3-3-1 (professional)
| Grand Prix San Diego 2015 (ORI standard) | starting rating: 1424 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 444 | Rider, Derek (1556) | Lost 1-2 | -161408 |
| 2standard | 479 | Soderberg, Alexander (1482) | Won 2-1 | +201428 |
| 3standard | 401 | Ballaris, Eddie (1498) | Lost 0-2 | -171411 |
| 4standard | 595 | Wang, Christopher (1505) | Won 2-1 | +201431 |
| 5standard | 380 | Pashby, Gregrey (1481) | Lost 1-2 | -171414 |
| 6standard | 465 | Caitung, Rocky (1497) | Won 2-0 | +191433 |
| top | average opponent: 1503record: 3-3 | new rating: 1433 | ||
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 24 | Snider, Jason (1427) | Lost 0-2 | -191459 |
| 4sealed | 133 | Lee, Tony (1490) | Lost 0-2 | -171442 |
| 5sealed | 287 | Soto Hernandez, Rodrigo (1443) | Lost 1-2 | -181424 |
| top | average opponent: 1453record: 0-3 | new rating: 1424 | ||
| Grand Prix Los Angeles 2014 (KTK standard) | starting rating: 1474 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 241 | Thomsen, Daniel (1500) | Lost 0-2 | -181456 |
| 2standard | 623 | Soto, Dylan (1483) | Lost 1-2 | -171439 |
| 3standard | 766 | Wong, James (1465) | Won 2-0 | +181457 |
| 4standard | 584 | Madison, Trystan (1483) | Won 2-0 | +191476 |
| 5standard | 418 | Wion, Mark (1503) | Won 2-0 | +181494 |
| 6standard | 444 | Fraser, Zach (1553) | Won 2-0 | +191513 |
| 7standard | 294 | Ayobi, Waheed (1505) | Lost 1-2 | -181495 |
| 8standard | 279 | Grace, Tannon (1545) | Lost 1-2 | -171478 |
| top | average opponent: 1505record: 4-4 | new rating: 1478 | ||
| Grand Prix Anaheim 2012 (Innistrad block) | starting rating: 1493 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 188 | Schmitt, Butch (1500) | Won 2-0 | +181511 |
| 2block | 159 | Geuens, Peter (1489) | Won 2-1 | +171528 |
| 3block | 48 | Van Valen, Aaron (1536) | Lost 0-2 | -171511 |
| 4block | 232 | Wood, Steven (1502) | Won 2-1 | +171528 |
| 5block | 79 | Alvarado Picazo, Arturo (1536) | Lost 1-2 | -171511 |
| 6block | 284 | Bird, Jordan (1470) | Lost 1-2 | -191492 |
| 7block | 246 | Vetter, Christopher (1500) | Lost 0-2 | -181474 |
| top | average opponent: 1505record: 3-4 | new rating: 1474 | ||
| Grand Prix San Diego 2011 (ISD limited) | starting rating: 1532 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 513 | Grywacheski, Chris (1500) | Won 2-0 | +171549 |
| 2sealed | 448 | Liang, Zhi (1480) | Lost 0-2 | -191530 |
| 3sealed | 512 | Farmer, Jon (1500) | Lost 0-2 | -191511 |
| 4sealed | 601 | Lew, Al (1485) | Lost 0-2 | -181493 |
| top | average opponent: 1491record: 1-3 | new rating: 1493 | ||
| Grand Prix Los Angeles 2002 (ONS rochester) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 115 | Austin, Alan (1500) | Won 2-0 | +181503 |
| 2sealed | 29 | Waite, Bill (1513) | Lost 1-2 | -181485 |
| 3sealed | 158 | Chu, Trevor (1520) | Won 2-0 | +191504 |
| 4sealed | 78 | Hakanson, Ben (1519) | Won 2-1 | +181522 |
| 5sealed | 48 | Hron, Mike (1632) | Lost 1-2 | -161506 |
| 6sealed | 93 | Reynolds, Rachel (1567) | Won 2-0 | +191525 |
| 7sealed | 78 | Dwyer, John (1610) | Won 2-0 | +201545 |
| 8sealed | 39 | Canu, Franck (1826) | Lost 1-2 | -131532 |
| top | average opponent: 1586record: 5-3 | new rating: 1532 | ||
| Grand Prix Las Vegas 2001 (extended) | starting rating: 1495 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 27 | Jaffee, Seth (1514) | Won 2-0 | +181513 |
| 5extended | 19 | Rubin, Benjamin (1919) | Draw 1-1 | +71520 |
| 6extended | 20 | Atherton, William (1577) | Lost 0-2 | -171503 |
| 7extended | 43 | Johnson, Matthew (1460) | Lost 1-2 | -181485 |
| top | average opponent: 1618record: 1-2-1 | new rating: 1485 | ||
| Pro Tour Barcelona 2001 (PLS draft) | starting rating: 1494 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 12 | Sonne, Jonathan (1502) | Lost 0-2 | -181476 |
| 2draft | 150 | Thicke, Michael (1488) | Lost 0-2 | -171459 |
| 3draft | 74 | Miyata, Hideyuki (1448) | Won 2-0 | +171476 |
| 4draft | 90 | Aldrich, Steven (1474) | Won 2-0 | +181494 |
| 5draft | 126 | Boneau, Trent (1480) | Draw 1-1 | 01494 |
| 6draft | 30 | Jarman, Jimmy (1553) | Won 2-1 | +191513 |
| 7draft | 58 | Pogacnik, Sebastian (1499) | Lost 0-2 | -181495 |
| top | average opponent: 1492record: 3-3-1 | new rating: 1495 | ||
| Grand Prix Phoenix 2000 (extended) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 39 | Blondet, Luis (1500) | Won 2-0 | +171551 |
| 2extended | 34 | Mortensen, Matthew (1500) | Lost 0-2 | -191532 |
| 3extended | 40 | Helding, Brandon (1464) | Lost 0-2 | -191513 |
| 4extended | 82 | St. Clair, Jeremy (1482) | Lost 1-2 | -191494 |
| top | average opponent: 1487record: 1-3 | new rating: 1494 | ||
| Grand Prix Seattle 2000 (extended) | starting rating: 1539 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 44 | DeWan, Gregory (1500) | Won 0-0 | +171556 |
| 2extended | 21 | Silkin, Misha (1518) | Lost 0-0 | -191537 |
| 3extended | 70 | MacKinnon, Michael (1459) | Lost 0-0 | -191518 |
| 4extended | 115 | Dunkin, Janelle (1482) | Won 0-0 | +171535 |
| 5extended | 84 | Nelson, Sam (1499) | Won 0-0 | +181553 |
| 6extended | 72 | Miller, John (1500) | Lost 0-0 | -191534 |
| top | average opponent: 1493record: 3-3 | new rating: 1534 | ||
| Grand Prix San Diego 1999 (MMQ limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 7 | Stenger, Christa (1518) | Won 0-0 | +181518 |
| 3sealed | 41 | Price, David (1626) | Lost 1-2 | -161502 |
| 4sealed | 60 | Fitzgerald, Sean (1518) | Lost 0-0 | -171485 |
| 5sealed | 85 | Paynter, Julie (1516) | Won 0-0 | +181503 |
| 6sealed | 49 | Angelo, Charles (1518) | Won 2-0 | +181521 |
| 7sealed | 36 | Craig, Mike (1527) | Won 0-0 | +191540 |
| 8draft | 23 | Carter, John (1472) | Draw 1-1 | -21538 |
| 9draft | 32 | Hamilton, Stuart (1537) | Won 0-0 | +181556 |
| 10draft | 18 | Elsberry, Greg (1556) | Lost 1-2 | -181538 |
| 11draft | 4 | Mourssali, Riad (1520) | Lost 0-0 | -181520 |
| 13draft | 8 | Eslami, Ali (1561) | Won 0-0 | +191539 |
| top | average opponent: 1534record: 6-4-1 | new rating: 1539 | ||