O'Connor, Nicholas B
Current rating: 1588
Record: 35-29-2 (GP) / 2-5-1 (professional)
| Grand Prix Portland 2013 (modern) | starting rating: 1593 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 208 | Stinnett, Benjamin (1489) | Lost 1-2 | -201573 |
| 2modern | 266 | Dalrymple, Trevor (1481) | Won 2-0 | +161589 |
| 3modern | 145 | Mangan, Tym K (1516) | Won 2-0 | +171606 |
| 4modern | 201 | Laskin, Lewis (1630) | Lost 0-2 | -181588 |
| top | average opponent: 1529record: 2-2 | new rating: 1588 | ||
| Grand Prix Pittsburgh 2011 (M12 standard) | starting rating: 1600 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 437 | Cabrera, Marco R (1500) | Won 2-0 | +161616 |
| 2standard | 295 | Williams, Devin (1518) | Won 2-0 | +171633 |
| 3standard | 27 | Reid, James (1503) | Lost 0-2 | -211612 |
| 4standard | 377 | KNAN, NOLAN (1518) | Lost 0-2 | -191593 |
| top | average opponent: 1510record: 2-2 | new rating: 1593 | ||
| Grand Prix Providence 2011 (legacy) | starting rating: 1582 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 23 | Jaco, Jason (1522) | Won 2-1 | +171599 |
| 2legacy | 25 | Fabiani, Pietro (1518) | Won 2-1 | +161615 |
| 3legacy | 24 | Collins, Chris (1517) | Won 2-1 | +161631 |
| 4legacy | 22 | Brown, Eric D (1611) | Won 2-1 | +181649 |
| 5legacy | 26 | Tocco, Mark (1563) | Lost 0-2 | -191630 |
| 6legacy | 69 | Segarra, Andre (1536) | Won 2-0 | +161646 |
| 7legacy | 50 | Marshall, Bob (1579) | Won 2-1 | +171663 |
| 8legacy | 23 | Tietze, Maxwell (1743) | Won 2-0 | +191682 |
| 9legacy | 18 | Barber, Jon (1538) | Lost 1-2 | -211661 |
| 10legacy | 45 | Juseck, William J (1609) | Lost 1-2 | -181643 |
| 11legacy | 60 | Weiner, Mark (1528) | Lost 0-2 | -211622 |
| 12legacy | 73 | Wilbur, Nick (1621) | Lost 0-2 | -181604 |
| 13legacy | 74 | Wilhelmi, Josh (1529) | Won 2-1 | +171621 |
| 14legacy | 61 | Wong, Ben (1470) | Lost 0-2 | -211600 |
| top | average opponent: 1563record: 8-6 | new rating: 1600 | ||
| Grand Prix Atlanta 2011 (extended) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 116 | Jessie, Jason R (1467) | Won 2-0 | +171550 |
| 2extended | 99 | Ball, Chris K (1518) | Lost 0-2 | -191531 |
| 3extended | 195 | Staton, Branch (1468) | Won 2-0 | +171548 |
| 4extended | 165 | Newby, John (1517) | Lost 0-2 | -181530 |
| 5extended | 174 | Fox, Christopher (1606) | Won 2-1 | +191549 |
| 6extended | 104 | Ley, Isaiah (1470) | Won 2-0 | +171566 |
| 7extended | 86 | Rinehart, Micah (1585) | Won 2-0 | +181584 |
| 8extended | 75 | Ramos, Michael (1504) | Lost 0-2 | -191565 |
| 9extended | 81 | Magararu, Juris (1524) | Won 2-0 | +171582 |
| top | average opponent: 1518record: 6-3 | new rating: 1582 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 584 | Meierdirks, Robert (1518) | Lost 1-2 | -191538 |
| 3sealed | 545 | Lanzo, Nic J (1500) | Won 2-1 | +181556 |
| 4sealed | 516 | Dykes, Tim (1499) | Won 2-0 | +161572 |
| 5sealed | 533 | Glore, David (1463) | Lost 1-2 | -201552 |
| 6sealed | 546 | Johnson, Case (1482) | Lost 0-2 | -191533 |
| top | average opponent: 1492record: 2-3 | new rating: 1533 | ||
| Grand Prix Columbus 2010 (legacy) | starting rating: 1504 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 41 | Starr, Dane C (1518) | Won 2-1 | +191523 |
| 3legacy | 42 | Budney, Nathan W (1516) | Lost 1-2 | -181505 |
| 4legacy | 124 | Mascioli, Chris (1557) | Won 2-1 | +191524 |
| 5legacy | 57 | Cline, Matthew (1590) | Won 2-0 | +191543 |
| 6legacy | 75 | Bertoncini, Alex (1560) | Won 2-1 | +181561 |
| 7legacy | 22 | Lundquist, Ben (1822) | Won 2-0 | +231584 |
| 8legacy | 26 | Lampron, Yan (1552) | Draw 1-1 | -11583 |
| 9legacy | 18 | Senneway, Bill (1533) | Won 2-0 | +171600 |
| 10legacy | 22 | Webster, Matthew (1598) | Won 2-0 | +181618 |
| 11legacy | 11 | Levin, Drew (1658) | Lost 0-2 | -171601 |
| 12legacy | 29 | Damo da Rosa, Paulo Vitor (2129) | Lost 1-2 | -91592 |
| 13legacy | 45 | Schumann, Glenn B (1606) | Won 2-1 | +181610 |
| 14legacy | 29 | Howe, Joshua (1579) | Lost 0-2 | -191591 |
| 15legacy | 41 | Nunez, Michael (1537) | Lost 1-2 | -191572 |
| 16legacy | 47 | Davis, Todd (1712) | Lost 0-2 | -151557 |
| top | average opponent: 1631record: 8-6-1 | new rating: 1557 | ||
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 223 | Jones, Jared (1645) | Won 2-1 | +211503 |
| 3standard | 80 | Getsay, Andrew (1539) | Won 2-1 | +191522 |
| 4standard | 139 | Levy, Raphael (1887) | Won 2-1 | +241546 |
| 5standard | 10 | Wildes, Chris (1571) | Lost 1-2 | -171529 |
| 6standard | 75 | Hall, Zack (1823) | Lost 0-2 | -131516 |
| 7standard | 168 | Scheel, Brandon (1887) | Lost 1-2 | -121504 |
| top | average opponent: 1725record: 3-3 | new rating: 1504 | ||
| Grand Prix Oakland 2010 (extended) | starting rating: 1488 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 140 | Sperling, Alexander (1533) | Lost 0-2 | -171471 |
| 3extended | 225 | Stein, Steven (1499) | Won 2-1 | +181489 |
| 4extended | 207 | Hsu, Yohsiang (1518) | Won 2-0 | +191508 |
| 5extended | 118 | Gray, Corbett (1706) | Lost 1-2 | -151493 |
| 6extended | 210 | Levy, Raphael (1894) | Lost 0-2 | -111482 |
| top | average opponent: 1630record: 2-3 | new rating: 1482 | ||
| Pro Tour Austin 2009 (extended) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 76 | Warmenhoven, Ruud (1813) | Lost 1-2 | -131508 |
| 2extended | 156 | Vargas, Antonio A (1486) | Lost 0-2 | -191489 |
| 3extended | 199 | Kohl, Reinhold (1809) | Won 2-0 | +241513 |
| 4extended | 159 | Thompson, Gerry (1798) | Won 2-1 | +231536 |
| 5extended | 112 | Fallgren, David (1540) | Draw 1-1 | 01536 |
| 6draft | 51 | Vieren, Pascal (1848) | Lost 1-2 | -121524 |
| 7draft | 13 | Fallgren, David (1527) | Lost 1-2 | -181506 |
| 8draft | 71 | Defraia, Andrea (1521) | Lost 0-2 | -181488 |
| top | average opponent: 1668record: 2-5-1 | new rating: 1488 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 504 | Van Lunen, Jacob (1621) | Draw 1-1 | +21502 |
| 4sealed | 488 | Hyde, Peter L (1467) | Lost 0-2 | -181484 |
| 5sealed | 555 | Ogrydziak, Jon (1488) | Won 2-0 | +181502 |
| 6sealed | 498 | Estabrook, Bree (1555) | Won 2-0 | +191521 |
| top | average opponent: 1533record: 2-1-1 | new rating: 1521 | ||