O'Neil, William
Current rating: 1613
Record: 33-25-1 (GP) / 4-5 (professional)
| Players Tour Online 4 (MTGA IKO standard) | starting rating: 1630 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 49 | Duke, Reid (2048) | Lost 0-2 | -111619 |
| 2standard | 93 | McCormick, Logan (1502) | Lost 0-2 | -201599 |
| 3standard | 152 | Oswald, Marc (1741) | Won 2-0 | +201619 |
| 4standard | 99 | Meramveliotakis, Nick (1499) | Won 2-0 | +161635 |
| 5standard | 78 | Holzinger, Thomas (1832) | Won 2-1 | +221657 |
| 6standard | 55 | Ingallinera, Daniele (1676) | Lost 1-2 | -181639 |
| 7standard | 75 | Anthony, Michael (1506) | Won 2-0 | +161655 |
| 8standard | 53 | Gyba, Konrad (1429) | Lost 0-2 | -221633 |
| 9standard | 89 | Krizkovsky, Frantisek (1550) | Lost 0-2 | -201613 |
| top | average opponent: 1643record: 4-5 | new rating: 1613 | ||
| Grand Prix Niagara Falls 2019 (legacy) | starting rating: 1609 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 190 | McFayden, Andrew (1466) | Won 2-0 | +161625 |
| 2legacy | 154 | Cook, Tyler (1491) | Won 2-1 | +151640 |
| 3legacy | 66 | MacDonald, Kyle (1518) | Lost 1-2 | -201620 |
| 4legacy | 253 | Kostrzewa, Krzysztof (1523) | Won 2-1 | +161636 |
| 5legacy | 108 | Ferguson, Conor (1554) | Won 2-1 | +171653 |
| 6legacy | 110 | Faibish, Corey (1528) | Won 2-1 | +161669 |
| 7legacy | 57 | Roth, Marcus (1601) | Lost 0-2 | -201649 |
| 8legacy | 138 | Ashlock, Richard (1563) | Lost 0-2 | -191630 |
| top | average opponent: 1530record: 5-3 | new rating: 1630 | ||
| Grand Prix Louisville 2017 (legacy) | starting rating: 1609 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 518 | Brown, James (1353) | Won 2-0 | +141623 |
| 2legacy | 437 | Van Leeuwen, Andrew (1722) | Won 2-0 | +201643 |
| 3legacy | 430 | Passarelli, Hayden (1707) | Won 2-1 | +191662 |
| 4legacy | 432 | Taylor, Joshua (1764) | Lost 0-2 | -161646 |
| 5legacy | 504 | Porchas, Justin (1532) | Won 2-0 | +161662 |
| 6legacy | 387 | Andersen, Christoffer (1767) | Lost 0-2 | -161646 |
| 7legacy | 565 | Liu, Sean (1509) | Won 2-1 | +151661 |
| 8legacy | 474 | Love, Jake (1461) | Lost 0-2 | -211640 |
| 9legacy | 613 | Hartless, Dylan (1458) | Won 2-1 | +141654 |
| 10legacy | 1146 | Champagne, Jeff (1635) | Lost 1-2 | -181636 |
| 11legacy | 1186 | Stephenson, Mitchell (1556) | Lost 1-2 | -201616 |
| 12legacy | 1214 | Thompson, Kevin (1479) | Lost 0-2 | -201596 |
| 13legacy | 1199 | Jacques, Billy (1426) | Won 2-0 | +151611 |
| 14legacy | 1165 | Hoose, Mason (1560) | Won 2-1 | +171628 |
| 15legacy | 1156 | Hamel, Olivier (1596) | Lost 1-2 | -191609 |
| top | average opponent: 1568record: 8-7 | new rating: 1609 | ||
| Grand Prix Atlantic City 2015 (DTK limited) | starting rating: 1617 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 117 | Niosi, Justin (1518) | Lost 1-2 | -201597 |
| 3sealed | 376 | Newby, John (1505) | Lost 1-2 | -201577 |
| 4sealed | 618 | Ciancia, Eve (1481) | Won 2-0 | +171594 |
| 5sealed | 461 | Peebles-Mundy, Benjamin (1877) | Won 2-1 | +231617 |
| 6sealed | 268 | DeLange, Gregory (1548) | Won 2-0 | +161633 |
| 7sealed | 155 | Dupal, Stephen (1506) | Won 2-0 | +161649 |
| 8sealed | 195 | Re, Joseph (1564) | Lost 1-2 | -191630 |
| 9sealed | 201 | Harlan, Bri (1516) | Lost 0-2 | -211609 |
| top | average opponent: 1564record: 4-4 | new rating: 1609 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1556 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 895 | Laberge, Vincent (1628) | Won 2-1 | +191575 |
| 3modern | 788 | Collett, Scott (1520) | Won 2-0 | +171592 |
| 4modern | 794 | Walker, Noah (1814) | Won 2-1 | +221614 |
| 5modern | 754 | Myers, Ryan (1570) | Lost 0-2 | -191595 |
| 6modern | 784 | Webster, Billy (1521) | Won 2-1 | +171612 |
| 7modern | 741 | Sacks, Neal (1640) | Won 2-1 | +191631 |
| 8modern | 711 | Majlaton, Alex (2041) | Won 2-1 | +251656 |
| 9modern | 728 | Godon, Carl (1602) | Lost 0-2 | -191637 |
| 10modern | 53 | Kanellis, David (1592) | Won 2-1 | +171654 |
| 11modern | 44 | Pratt, Taylor (1641) | Lost 1-2 | -181636 |
| 12modern | 105 | Yeaton, Matthew (1597) | Draw 1-1 | -11635 |
| 13modern | 84 | Reznikov, Eugene (1598) | Lost 0-2 | -191616 |
| 14modern | 104 | Kuranda, Matthew (1552) | Won 0-0 | +171633 |
| 15modern | 82 | Duerr, Eric (1729) | Lost 0-2 | -161617 |
| top | average opponent: 1646record: 8-5-1 | new rating: 1617 | ||
| Grand Prix Montreal 2014 (BNG limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 129 | Arends, Randolph (1815) | Won 2-0 | +241524 |
| 3sealed | 44 | Ha, Chris (1499) | Lost 1-2 | -191505 |
| 4sealed | 405 | Vegh, Michael (1520) | Won 2-1 | +181523 |
| 5sealed | 275 | Vaccaro, John (1519) | Won 2-1 | +181541 |
| 6sealed | 162 | Clarke, Brendan (1628) | Won 2-1 | +201561 |
| 7sealed | 108 | Levstein, Alexander (1567) | Won 2-0 | +181579 |
| 8sealed | 47 | Roy, Mageael (1653) | Won 2-0 | +191598 |
| 9sealed | 24 | Santa, Richard (1620) | Won 2-1 | +191617 |
| 10draft | 955 | Dore, Maxime (1620) | Lost 1-2 | -181599 |
| 11draft | 971 | Mancuso, Adam (1876) | Lost 0-2 | -131586 |
| 12draft | 963 | Dubreuil, Patrice (1603) | Lost 1-2 | -181568 |
| 13draft | 950 | Zeman, Tyson (1679) | Lost 1-2 | -161552 |
| 14draft | 917 | Davoudi, Mani (1783) | Won 2-1 | +221574 |
| 15draft | 961 | Beauregard, Benoit (1562) | Lost 1-2 | -181556 |
| top | average opponent: 1639record: 8-6 | new rating: 1556 | ||