O'Connor, Marc
Current rating: 1502
Record: 10-12
| Grand Prix Providence 2015 (DTK standard) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 18 | Yu, Zhuoran (1461) | Lost 1-2 | -181444 |
| 2standard | 343 | Bowes, Todd (1482) | Won 2-1 | +191463 |
| 3standard | 328 | Palovich, Chris (1571) | Won 2-0 | +201483 |
| 4standard | 276 | White, Trevor (1509) | Won 2-1 | +181501 |
| 5standard | 75 | Weed, Bret (1692) | Won 2-0 | +211522 |
| 6standard | 84 | Lewis, Aaron (1912) | Lost 0-2 | -111511 |
| 7standard | 140 | Chapin, Patrick (2037) | Lost 0-2 | -91502 |
| top | average opponent: 1666record: 4-3 | new rating: 1502 | ||
| Grand Prix Atlantic City 2015 (DTK limited) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 439 | Caporal, Anthony (1463) | Won 2-1 | +181467 |
| 2sealed | 279 | Phillips, Herbert (1500) | Won 2-1 | +191486 |
| 3sealed | 353 | Tautic, Raymond (1854) | Lost 1-2 | -121474 |
| 4sealed | 484 | DeLange, Jason (1540) | Won 2-1 | +191493 |
| 5sealed | 201 | Karakarlis, Andrew (1488) | Won 2-0 | +181511 |
| 6sealed | 164 | Healy, John (1564) | Lost 0-2 | -171494 |
| 7sealed | 271 | Ho, Eugene (1662) | Lost 1-2 | -151479 |
| 8sealed | 281 | Madden, Ryan (1521) | Lost 0-2 | -171462 |
| top | average opponent: 1574record: 4-4 | new rating: 1462 | ||
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 547 | Jeffery, Clifton (1500) | Won 2-1 | +191484 |
| 2sealed | 213 | Brown, Derek (1518) | Lost 0-2 | -181466 |
| 3sealed | 354 | Egna, Michael (1500) | Lost 0-2 | -171449 |
| top | average opponent: 1506record: 1-2 | new rating: 1449 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 218 | Ellis, Jason (1500) | Lost 0-2 | -181482 |
| 2sealed | 315 | Sheridan, Brendan (1482) | Lost 0-2 | -181464 |
| 3sealed | 330 | Thompson, Kale (1512) | Won 2-0 | +191483 |
| 4sealed | 295 | Shaler, Russell (1482) | Lost 0-2 | -181465 |
| top | average opponent: 1494record: 1-3 | new rating: 1465 | ||