Headley, David
Current rating: 1590
Record: 41-36-2
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1579 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 254 | Ni, Jay (1537) | Draw 1-1 | -11578 |
| 3sealed | 234 | Scofield, Tanner (1476) | Won 2-0 | +161594 |
| 4sealed | 120 | Dunn, Randy (1564) | Won 2-0 | +171611 |
| 5sealed | 60 | Kung, Ted (1544) | Lost 0-2 | -191592 |
| 6sealed | 144 | Ghouth, Yusef (1537) | Won 2-1 | +171609 |
| 7sealed | 86 | Kaspar, Kendall (1564) | Lost 1-2 | -191590 |
| top | average opponent: 1537record: 3-2-1 | new rating: 1590 | ||
| Grand Prix Manchester 2014 (Theros block) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 68 | Garner, Jade (1500) | Won 2-0 | +181543 |
| 2block | 251 | Swanljung, Klas (1518) | Won 2-1 | +171560 |
| 3block | 175 | Glied, Tamas (1829) | Lost 0-2 | -131547 |
| 4block | 354 | Stone, Benjamin (1569) | Lost 1-2 | -171530 |
| 5block | 479 | Kerr, Jacob (1498) | Won 2-0 | +171547 |
| 6block | 330 | Harris, Toby (1458) | Won 2-1 | +161563 |
| 7block | 19 | Clarke, Daniel (1538) | Won 2-0 | +181581 |
| 8block | 162 | Bennett, Stephen (1555) | Won 2-1 | +171598 |
| 9block | 157 | Goertzen, Dominik (1498) | Lost 1-2 | -191579 |
| top | average opponent: 1551record: 6-3 | new rating: 1579 | ||
| Grand Prix Cincinnati 2014 (BNG standard) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 243 | Cochran, Julie (1500) | Won 2-0 | +171543 |
| 2standard | 410 | Dreher, Gregory (1671) | Lost 0-2 | -151528 |
| 3standard | 470 | Hodges, Nick (1484) | Lost 1-2 | -191509 |
| 4standard | 544 | Black, NIcholas (1482) | Won 2-0 | +171526 |
| 5standard | 445 | Hartlauf, Gordon (1498) | Won 2-0 | +181544 |
| 6standard | 465 | Cibak, Kyle (1509) | Lost 0-2 | -191525 |
| top | average opponent: 1524record: 3-3 | new rating: 1525 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1589 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 263 | Staver, Justin (1500) | Lost 0-2 | -201569 |
| 2modern | 600 | McElroy, Parker (1482) | Lost 1-2 | -201549 |
| 3modern | 641 | Hirsh, Zachary (1412) | Won 2-0 | +161565 |
| 4modern | 642 | Irving, Quaid (1469) | Lost 0-2 | -201545 |
| 5modern | 589 | Somavilla, Daniel (1478) | Lost 1-2 | -191526 |
| top | average opponent: 1468record: 1-4 | new rating: 1526 | ||
| Grand Prix Vancouver 2014 (THS standard) | starting rating: 1578 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 49 | Mathers, Callum (1500) | Won 2-0 | +161594 |
| 2standard | 91 | Rathvon, Mark (1524) | Won 2-0 | +171611 |
| 3standard | 21 | DeVries, Coltin (1537) | Won 2-1 | +171628 |
| 4standard | 37 | Gilbert-Espada, Klemente (1647) | Lost 1-2 | -181610 |
| 5standard | 63 | Annand, Benjamin (1536) | Lost 0-2 | -191591 |
| 6standard | 181 | Nguyen, Charlie (1534) | Won 2-0 | +171608 |
| 7standard | 147 | Wu, Lance (1548) | Lost 1-2 | -191589 |
| top | average opponent: 1546record: 4-3 | new rating: 1589 | ||
| Grand Prix Las Vegas 2013 (MMA limited) | starting rating: 1561 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 553 | Rahamim, Avri (1506) | Lost 0-2 | -191542 |
| 5sealed | 631 | Medina Cuenod, Felipe (1533) | Won 2-1 | +181560 |
| 6sealed | 385 | Freeman Gutierrez, Rodolfo (1502) | Won 2-1 | +161576 |
| 7sealed | 323 | Denney, Jonathan (1660) | Draw 1-1 | +21578 |
| 8sealed | 270 | Haavikko, Axel (1574) | Won 2-1 | +181596 |
| 9sealed | 222 | Allen, John (1587) | Lost 1-2 | -181578 |
| top | average opponent: 1560record: 3-2-1 | new rating: 1578 | ||
| Grand Prix Toronto 2012 (modern) | starting rating: 1561 | |||
| round | table | opponent (rating) | result | Δrating |
| 4modern | 93 | Casselman, Jeffrey (1584) | Won 2-0 | +191580 |
| 5modern | 53 | Nguyen, Laurent (1572) | Won 2-0 | +181598 |
| 6modern | 20 | Feingersh, Rachel (1631) | Lost 1-2 | -181580 |
| 7modern | 76 | Dzandzalas, Peter (1577) | Lost 1-2 | -181562 |
| 8modern | 87 | Cameron, Anthony (1553) | Won 2-1 | +181580 |
| 9modern | 41 | Giles, Devon (1508) | Lost 0-2 | -191561 |
| top | average opponent: 1571record: 3-3 | new rating: 1561 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1574 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 7 | Zachow, Andrew (1688) | Won 2-1 | +201594 |
| 4modern | 3 | Dixon, Kelsey (1640) | Lost 0-2 | -171577 |
| 5modern | 110 | McAllister, Bruce (1535) | Won 2-1 | +171594 |
| 6modern | 160 | Jacobson, Mary (1663) | Lost 1-2 | -171577 |
| 7modern | 149 | Hallahan, Brian (1472) | Won 2-1 | +161593 |
| 8modern | 70 | Bader, Travis (1509) | Lost 0-2 | -191574 |
| 9modern | 143 | Gatica, Miguel (1888) | Lost 1-2 | -131561 |
| top | average opponent: 1628record: 3-4 | new rating: 1561 | ||
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 199 | Benefield, Eiko (1537) | Won 2-0 | +181575 |
| 5sealed | 4 | Wilson, Jacob (1808) | Won 2-1 | +221597 |
| 6sealed | 42 | Bogner, Ryan (1776) | Won 2-1 | +211618 |
| 7sealed | 24 | Bourroughs, Chris (1618) | Won 2-0 | +181636 |
| 8sealed | 4 | Emmert, Jeff (1611) | Won 2-1 | +181654 |
| 9sealed | 4 | Cheng, Johnny (1577) | Lost 0-2 | -201634 |
| 10sealed | 19 | Szelzki, Jeffrey (1676) | Lost 0-2 | -171617 |
| 11draft | 65 | Jacob, Michael (1882) | Lost 0-2 | -131604 |
| 12draft | 2 | Wells, Venu (1674) | Lost 1-2 | -171587 |
| 13draft | 62 | Raz, Lemuel (1618) | Won 2-0 | +191606 |
| 14draft | 102 | Gotimer, Daniel (1643) | Lost 1-2 | -181588 |
| 15draft | 95 | Schmidt, Joseph (1792) | Lost 0-2 | -141574 |
| top | average opponent: 1684record: 6-6 | new rating: 1574 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 223 | Logan, Patrick (1518) | Won 2-1 | +181554 |
| 3modern | 161 | Woodsmith, Tristan (1526) | Won 2-0 | +171571 |
| 4modern | 159 | Chang, Morgan (1680) | Lost 1-2 | -161555 |
| 5modern | 236 | Collins, Aaron A (1438) | Lost 0-2 | -201535 |
| 6modern | 177 | Zaffino, Kyle (1468) | Won 2-0 | +171552 |
| 7modern | 146 | Gibbs, Joel (1536) | Won 2-1 | +181570 |
| 8modern | 110 | Utter-Leyton, Josh (1866) | Lost 1-2 | -131557 |
| top | average opponent: 1576record: 4-3 | new rating: 1557 | ||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 109 | Paluska, James (1500) | Lost 0-2 | -181482 |
| 2sealed | 364 | Smaker, Nathan (1482) | Lost 0-2 | -181464 |
| 3sealed | 476 | Woudstra, Jesse (1464) | Won 2-0 | +181482 |
| 4sealed | 393 | Gapinski, Jodi (1499) | Won 2-0 | +181500 |
| 5sealed | 343 | Bonty, Andrew (1501) | Lost 1-2 | -181482 |
| 6sealed | 296 | Kidonakis, James (1501) | Won 2-0 | +191501 |
| 7sealed | 227 | Voduarka, Jesse J (1478) | Won 2-1 | +171518 |
| 8sealed | 181 | Paar, John (1517) | Won 2-1 | +181536 |
| top | average opponent: 1493record: 5-3 | new rating: 1536 | ||