Assiff, Spencer
Current rating: 1585
Record: 41-37 (GP) / 1-4 (professional)
Grand Prix New Jersey 2006Grand Prix Columbus 2007Grand Prix Philadelphia 2008Grand Prix Indianapolis 2008Grand Prix Chicago 2009Grand Prix Boston 2009Grand Prix Washington DC 2010Grand Prix Columbus 2012Grand Prix Boston-Worcester 2012Grand Prix Washington DC 2013Grand Prix Richmond 2014Pro Tour Dragons of TarkirRegional Championships Atlanta 2023
| Regional Championships Atlanta 2023 (pioneer) | starting rating: 1562 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 532 | Litfin, Robert (1554) | Won 2-1 | +181580 |
| 2pioneer | 118 | Whitlow, Patrick (1555) | Won 2-1 | +171597 |
| 3pioneer | 21 | Matthews, Victor (1540) | Won 2-0 | +171614 |
| 4pioneer | 18 | Manges, James (1769) | Lost 1-2 | -151599 |
| 5pioneer | 83 | Mahr, Philip (1745) | Lost 1-2 | -151584 |
| 6pioneer | 300 | Kainste, Nathan (1484) | Lost 0-2 | -201564 |
| 7pioneer | 350 | Jones, Eric (1721) | Won 2-1 | +211585 |
| 8pioneer | 210 | Curry, Larry (1562) | Lost 0-2 | -191566 |
| 9pioneer | 249 | Gassaway, Ryan (1613) | Won 2-0 | +191585 |
| top | average opponent: 1616record: 5-4 | new rating: 1585 | ||
| Pro Tour Dragons of Tarkir (DTK standard) | starting rating: 1603 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 45 | Anceschi, Marco (1782) | Lost 1-2 | -151588 |
| 2draft | 184 | Tautic, Raymond (1875) | Won 2-0 | +231611 |
| 3draft | 119 | Bearl, Ken (1676) | Lost 1-2 | -171594 |
| 4standard | 182 | Wildes, Julian (1708) | Lost 0-2 | -161578 |
| 5standard | 175 | Cowe, Patrick (1671) | Lost 1-2 | -161562 |
| top | average opponent: 1742record: 1-4 | new rating: 1562 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1613 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 178 | Russell, Thomas (1505) | Lost 0-2 | -201593 |
| 2modern | 348 | Winesburg, Kati (1383) | Won 2-1 | +141607 |
| 3modern | 398 | Sousa, Johnny (1500) | Won 2-1 | +161623 |
| 4modern | 252 | Ross, Robert (1497) | Lost 0-2 | -201603 |
| top | average opponent: 1471record: 2-2 | new rating: 1603 | ||
| Grand Prix Washington DC 2013 (legacy) | starting rating: 1585 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 277 | Wolfe, Ryan (1350) | Lost 1-2 | -231562 |
| 3legacy | 446 | Bowers, Adam (1510) | Won 2-0 | +171579 |
| 4legacy | 291 | Ponting, Kory (1516) | Won 2-0 | +171596 |
| 5legacy | 182 | Gareau, Philippe (1678) | Won 2-1 | +201616 |
| 6legacy | 148 | Alberty, Giovanni (1498) | Lost 1-2 | -201596 |
| 7legacy | 421 | Conicelli, Frank (1537) | Won 2-0 | +161612 |
| 8legacy | 139 | O'Donnell, Conor (1565) | Won 2-0 | +181630 |
| 9legacy | 169 | Tenjum, Andrew (1690) | Lost 0-2 | -171613 |
| top | average opponent: 1543record: 5-3 | new rating: 1613 | ||
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1603 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 46 | Elliot, Shane (1535) | Won 2-1 | +171620 |
| 4sealed | 137 | Johnson-Epstein, Jasper (1745) | Lost 1-2 | -161604 |
| 5sealed | 289 | Avilla, Anthony (1534) | Lost 1-2 | -191585 |
| top | average opponent: 1605record: 1-2 | new rating: 1585 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1589 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 103 | McWhorter, Justin (1480) | Won 2-0 | +161605 |
| 3modern | 103 | Littman, Fai (1709) | Lost 0-2 | -161589 |
| 4modern | 197 | Watts, Andrew (1483) | Won 2-0 | +161605 |
| 5modern | 190 | Jessup, Daniel (1496) | Won 2-1 | +161621 |
| 6modern | 98 | Hulings, Brandon (1540) | Lost 1-2 | -201601 |
| 7modern | 217 | Wise, Nick (1746) | Won 2-0 | +211622 |
| 8modern | 72 | Georg, Adam (1555) | Lost 1-2 | -191603 |
| top | average opponent: 1573record: 4-3 | new rating: 1603 | ||
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 662 | Skourtis, Christopher (1495) | Won 2-0 | +201432 |
| 2standard | 639 | Miguel, Andres (1596) | Won 2-1 | +211453 |
| 3standard | 675 | Leitzinger, Gerald (1610) | Won 2-1 | +201473 |
| 4standard | 696 | Sovol, Oliver P (1560) | Won 2-1 | +201493 |
| 5standard | 650 | Zhang, Zhiyang (1707) | Lost 0-2 | -141479 |
| 6standard | 634 | Tietze, Maxwell (1623) | Won 2-1 | +201499 |
| 7standard | 651 | Richardson, Tyler (1594) | Won 2-0 | +201519 |
| 8standard | 621 | Wantz, Brad (1643) | Won 2-1 | +201539 |
| 9standard | 623 | Scherer, Caleb (1621) | Won 2-1 | +201559 |
| 10standard | 8 | Ochoa, David (2076) | Won 2-1 | +271586 |
| 11standard | 11 | Nyberg, Michael (1649) | Lost 0-2 | -171569 |
| 12standard | 39 | Jacob, Michael (1901) | Won 2-1 | +241593 |
| 13standard | 10 | Postlethwait, William (1819) | Lost 1-2 | -141579 |
| 14standard | 31 | Tuchek, Stephen (1573) | Won 2-1 | +181597 |
| 15standard | 21 | Malin, Antti (1929) | Lost 0-2 | -131584 |
| 16standard | 28 | Burris, Josh (1789) | Won 2-1 | +221606 |
| 17standard | 27 | Jacobson, Josh (1648) | Lost 0-2 | -171589 |
| top | average opponent: 1696record: 12-5 | new rating: 1589 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1402 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 159 | Wojnarski, Ryan (1500) | Won 2-0 | +201422 |
| 2sealed | 187 | Huynh, Anthony (1518) | Lost 1-2 | -171405 |
| 3sealed | 244 | Schneider, Brian (1525) | Lost 0-2 | -161389 |
| 4sealed | 259 | Bursey, Joshua (1466) | Won 2-0 | +201409 |
| 5sealed | 200 | Harrison, Jonathan (1499) | Won 2-0 | +191428 |
| 6sealed | 114 | White, Mark A (1516) | Lost 1-2 | -161412 |
| top | average opponent: 1504record: 3-3 | new rating: 1412 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1454 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 220 | Allen, James C (1539) | Lost 0-2 | -171437 |
| 2legacy | 480 | Mueller, Michael (1482) | Lost 0-2 | -171420 |
| 3legacy | 497 | Zeimentz, Mike (1392) | Lost 1-2 | -181402 |
| top | average opponent: 1471record: 0-3 | new rating: 1402 | ||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1469 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 290 | Boyer, Ashley (1500) | Lost 0-2 | -171452 |
| 2sealed | 395 | Massengill, Drew (1483) | Won 2-0 | +181470 |
| 3sealed | 422 | Tzaneteas, Elliott (1491) | Lost 0-2 | -171453 |
| 4sealed | 421 | Adams, Clifton (1483) | Won 2-0 | +181471 |
| 5sealed | 304 | Rothrock, Andrew (1498) | Lost 1-2 | -171454 |
| top | average opponent: 1491record: 2-3 | new rating: 1454 | ||
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 227 | Martin, Russ (1393) | Lost 1-2 | -201506 |
| 2extended | 293 | Ackroyd-Isales, Daniel (1501) | Lost 1-2 | -181488 |
| 3extended | 429 | Baldasari, Antonino (1464) | Lost 0-2 | -191469 |
| top | average opponent: 1452record: 0-3 | new rating: 1469 | ||
| Grand Prix Columbus 2007 (legacy) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 238 | Jones, Trent (1575) | Won 2-1 | +201485 |
| 2legacy | 96 | Swigart, Tyson T (1517) | Won 2-1 | +191504 |
| 3legacy | 60 | Calhoun, Bruce (1587) | Lost 0-2 | -171487 |
| 4legacy | 252 | Marucci, Joe (1517) | Won 2-0 | +191506 |
| 5legacy | 95 | Mancinelli, Matthew (1536) | Won 2-1 | +181524 |
| 6legacy | 40 | Roystan, Andrew (1614) | Lost 1-2 | -161508 |
| 7legacy | 87 | Gough, Marcus (1530) | Won 2-0 | +181526 |
| 8legacy | 50 | Haynes, Terry (1552) | Won 2-1 | +191545 |
| 9legacy | 52 | Swartz, Noah (1520) | Lost 1-2 | -191526 |
| top | average opponent: 1550record: 6-3 | new rating: 1526 | ||
| Grand Prix New Jersey 2006 (TSP limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 58 | Lurker, Scott (1500) | Won 2-0 | +181518 |
| 2sealed | 18 | Evenpenle, Colby (1518) | Lost 1-2 | -181500 |
| 3sealed | 302 | Ingram, Peter (1501) | Lost 1-2 | -181482 |
| 4sealed | 371 | Merwin, Jason (1534) | Lost 0-2 | -171465 |
| top | average opponent: 1513record: 1-3 | new rating: 1465 | ||