O'Sullivan, Jeff
Current rating: 1473
Record: 18-23
| Grand Prix New Jersey 2017 (lim) (XLN limited) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 154 | Klinkhammer, Matthew (1563) | Won 2-0 | +201482 |
| 2sealed | 64 | Magnant, Nicholas (1518) | Won 2-1 | +191501 |
| 3sealed | 212 | Guillenea Pujalte, Juan (1811) | Lost 1-2 | -131488 |
| 4sealed | 319 | Hall, David [CAN] (1581) | Lost 0-2 | -161472 |
| 5sealed | 282 | Clark, David Eugene (1505) | Won 2-0 | +181490 |
| 6sealed | 183 | Carleton-Barnes, Gabriel (2034) | Won 2-1 | +271517 |
| 7sealed | 248 | Morawski, Jonathan (1929) | Lost 1-2 | -101507 |
| 8sealed | 269 | Durham, Christian (1528) | Lost 0-2 | -181489 |
| 9sealed | 287 | Chen, Gary (1598) | Lost 0-2 | -161473 |
| top | average opponent: 1674record: 4-5 | new rating: 1473 | ||
| Grand Prix New Jersey 2017 (std) (AER standard) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 223 | Clute, Austin (1477) | Lost 0-2 | -191499 |
| 2standard | 520 | Creegan, Patrick (1489) | Won 2-1 | +181517 |
| 3standard | 563 | Kent, Doug (1569) | Lost 0-2 | -171500 |
| 4standard | 696 | Casavant, Steven (1469) | Lost 1-2 | -181482 |
| 5standard | 693 | Cesarano, Alexster (1456) | Lost 1-2 | -191463 |
| 6standard | 689 | Butler, Thomas (1460) | Won 2-0 | +181481 |
| 7standard | 610 | Moore, Markus (1462) | Lost 1-2 | -181463 |
| 8standard | 548 | Quirke, Ethan (1444) | Won 2-0 | +171480 |
| 9standard | 450 | Louie, Justin (1474) | Lost 1-2 | -181462 |
| top | average opponent: 1478record: 3-6 | new rating: 1462 | ||
| Grand Prix Providence 2016 (KLD standard) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 368 | McGrath, Andrew (1465) | Lost 1-2 | -171414 |
| 2standard | 433 | Moore, Michael (1403) | Won 2-1 | +181432 |
| 3standard | 364 | Badrudin, Karim (1589) | Lost 0-2 | -161416 |
| 4standard | 411 | Brown, Nick (1484) | Won 2-0 | +201436 |
| 5standard | 304 | DeJoy, Joseph (1680) | Lost 1-2 | -141422 |
| 6standard | 399 | Kwok, Cosmo (1519) | Won 2-1 | +201442 |
| 7standard | 364 | Altman, Amy (1512) | Won 2-1 | +191461 |
| 8standard | 248 | Doehring, Matthew (1503) | Won 2-0 | +191480 |
| 9standard | 199 | Campen, Steve (1514) | Won 2-0 | +181498 |
| 10standard | 434 | Benn, Adam (1709) | Lost 1-2 | -141484 |
| 11standard | 481 | Lee, Herman (1770) | Won 2-0 | +231507 |
| 12standard | 456 | Vidugiris, Gaudenis (1789) | Lost 0-2 | -131494 |
| 13standard | 438 | Marmulstein, Rion (1757) | Won 2-1 | +231517 |
| 14standard | 413 | Rodriguez, Thomas (1568) | Lost 0-2 | -171500 |
| 15standard | 434 | Novins, Michael (1506) | Won 2-1 | +181518 |
| top | average opponent: 1584record: 9-6 | new rating: 1518 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 770 | O'Shea, Andrew (1483) | Won 2-0 | +181518 |
| 3modern | 730 | Greene, Brian (1387) | Lost 0-2 | -211497 |
| 4modern | 1032 | Wight, Lawrence (1437) | Lost 1-2 | -191478 |
| 5modern | 1120 | Lafenetre, Gael (1596) | Won 2-0 | +201498 |
| 6modern | 879 | Wilkins, Bryon (1511) | Lost 0-2 | -171481 |
| 7modern | 951 | Hanson, Daniel (1628) | Lost 1-2 | -161465 |
| 8modern | 930 | Repta, Joel (1569) | Lost 0-2 | -161449 |
| 9modern | 886 | Torres, Ivan (1453) | Lost 1-2 | -181431 |
| top | average opponent: 1508record: 2-6 | new rating: 1431 | ||