Quackenbush, Mark
Current rating: 1594
Record: 31-28-1
| Grand Prix Providence 2015 (DTK standard) | starting rating: 1608 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 256 | Galante, David (1500) | Won 2-0 | +161624 |
| 2standard | 151 | Simmons, Barry (1482) | Won 2-1 | +161640 |
| 3standard | 86 | Spear, Chris (1541) | Won 2-0 | +161656 |
| 4standard | 118 | Demicco, Edward (1529) | Lost 1-2 | -201636 |
| 5standard | 213 | Rivas, Eduardo (1478) | Lost 1-2 | -211615 |
| 6standard | 293 | Blaylock, Luther (1466) | Lost 1-2 | -211594 |
| top | average opponent: 1499record: 3-3 | new rating: 1594 | ||
| Grand Prix Atlantic City 2013 (RTR standard) | starting rating: 1631 | |||
| round | table | opponent (rating) | result | Δrating |
| 4standard | 139 | Miklinevich, John (1529) | Won 2-0 | +161647 |
| 5standard | 34 | Reed, David (1487) | Lost 1-2 | -211626 |
| 6standard | 202 | Bravstein, Jeffrey (1662) | Lost 1-2 | -171609 |
| 7standard | 170 | Pace, Joe (1670) | Won 2-0 | +191628 |
| 8standard | 233 | Porter, Ryan (1554) | Lost 0-2 | -201608 |
| top | average opponent: 1580record: 2-3 | new rating: 1608 | ||
| Grand Prix Indianapolis 2012 (legacy) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 286 | Hatfield, Jesse (1600) | Won 2-1 | +201501 |
| 3legacy | 137 | Accetturo, Vince (1537) | Won 2-0 | +191520 |
| 4legacy | 137 | McKee, Kevin (1507) | Won 2-0 | +181538 |
| 5legacy | 32 | Rasmussen, Jeff (1558) | Won 2-0 | +181556 |
| 6legacy | 38 | Lax, Ari (1977) | Won 2-0 | +251581 |
| 7legacy | 10 | Rye, Frank W (1548) | Won 2-0 | +181599 |
| 8legacy | 2 | Rubin, Steve (1803) | Lost 0-2 | -141585 |
| 9legacy | 10 | Connor, Nathan (1608) | Lost 0-2 | -181567 |
| 10legacy | 31 | Tam, Wayne (1565) | Won 2-0 | +181585 |
| 11legacy | 19 | Large, Brandon (1632) | Lost 0-2 | -171568 |
| 12legacy | 53 | Lanthier, Dan (1708) | Won 2-0 | +201588 |
| 13legacy | 44 | Patnode, Nicholas (1666) | Won 2-1 | +201608 |
| 14legacy | 19 | Thatch, Jonathan (1629) | Won 2-0 | +181626 |
| 15legacy | 13 | Dembinski, Kyle (1884) | Draw 1-1 | +51631 |
| top | average opponent: 1659record: 10-3-1 | new rating: 1631 | ||
| Grand Prix Montreal 2011 (M12 limited) | starting rating: 1471 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 101 | Donelle, Matthew (1500) | Won 2-0 | +191490 |
| 2sealed | 37 | Morton, Andrew (1448) | Won 2-1 | +171507 |
| 3sealed | 48 | Blais Bourget, Gabriel (1538) | Lost 0-2 | -181489 |
| 4sealed | 97 | Erikson, Matt (1502) | Won 2-0 | +191508 |
| 5sealed | 62 | Lam, Martin (1502) | Won 2-0 | +181526 |
| 6sealed | 63 | Elarar, Jay (1713) | Lost 1-2 | -151511 |
| 7sealed | 76 | Williams, David A (1831) | Lost 0-2 | -121499 |
| 8sealed | 99 | Chang, Michael Y (1536) | Lost 0-2 | -181481 |
| top | average opponent: 1571record: 4-4 | new rating: 1481 | ||
| Grand Prix Providence 2011 (legacy) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 127 | Xidea, Ronald (1491) | Lost 0-2 | -171431 |
| 3legacy | 127 | Alexander, Jai (1483) | Won 2-1 | +191450 |
| 4legacy | 137 | Bourque, Jason (1507) | Lost 0-2 | -171433 |
| 5legacy | 217 | Onland, Jesse (1471) | Won 2-0 | +181451 |
| 6legacy | 104 | Wickersham, Ray A (1465) | Won 2-1 | +191470 |
| 7legacy | 130 | Blair, Molly (1492) | Won 2-0 | +181488 |
| 8legacy | 68 | Chlobowski, Dominik (1541) | Lost 1-2 | -171471 |
| top | average opponent: 1493record: 4-3 | new rating: 1471 | ||
| Grand Prix Toronto 2010 (SOM limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 28 | Hintermeister, Jason (1518) | Won 2-0 | +181499 |
| 3sealed | 62 | Van Lunen, Jacob (1564) | Lost 1-2 | -161483 |
| 4sealed | 163 | Rigby, Neil (1541) | Lost 0-2 | -171466 |
| 5sealed | 223 | Root, Wesley (1482) | Lost 0-2 | -181448 |
| top | average opponent: 1526record: 1-3 | new rating: 1448 | ||
| Grand Prix Columbus 2010 (legacy) | starting rating: 1476 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 41 | Corvese, Harry (1492) | Won 2-1 | +181494 |
| 2legacy | 128 | Sudeikis, Daniel M (1518) | Won 2-1 | +191513 |
| 3legacy | 41 | Folinus, Jeff (1708) | Won 2-0 | +211534 |
| 4legacy | 69 | Parker, Jon (1466) | Lost 0-2 | -191515 |
| 5legacy | 117 | Starr, Anh Thai (1505) | Lost 0-2 | -181497 |
| 6legacy | 151 | Benanzer, Andrew S (1615) | Lost 1-2 | -161481 |
| top | average opponent: 1551record: 3-3 | new rating: 1481 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 139 | Campbell, Maclain (1500) | Won 2-0 | +191469 |
| 2legacy | 246 | Epelbaum, Thomas (1518) | Lost 1-2 | -181451 |
| 3legacy | 391 | Barnes, Joel 2 (1555) | Won 2-0 | +201471 |
| 4legacy | 261 | Drebsky, David (1563) | Lost 0-2 | -161455 |
| 5legacy | 422 | Hammer, James (1520) | Lost 1-2 | -171438 |
| 6legacy | 396 | Knerr, Danny (1484) | Won 2-1 | +191457 |
| 7legacy | 276 | Smith, Justin P (1501) | Won 2-0 | +191476 |
| top | average opponent: 1520record: 4-3 | new rating: 1476 | ||
| Grand Prix Los Angeles 2009 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 36 | Epstein, Phillip (1539) | Lost 0-2 | -171483 |
| 3extended | 247 | Fuentes, Jeremy (1545) | Lost 1-2 | -171466 |
| 4extended | 336 | Wijaya, Vidianto (1562) | Lost 0-2 | -161450 |
| top | average opponent: 1549record: 0-3 | new rating: 1450 | ||