O'Brien, Andrew
Current rating: 1515
Record: 18-19-2
| Grand Prix New Jersey 2020 (THB limited) | starting rating: 1554 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 305 | Galstian, Andrew (1506) | Won 2-1 | +171571 |
| 2sealed | 76 | Johnson, Patrick (1666) | Lost 0-2 | -161555 |
| 3sealed | 561 | Lee, Dustin (1393) | Lost 1-2 | -211534 |
| 4sealed | 550 | He, Stephen (1483) | Lost 1-2 | -191515 |
| top | average opponent: 1512record: 1-3 | new rating: 1515 | ||
| Grand Prix Seattle 2018 (legacy) (legacy) | starting rating: 1512 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 392 | Raines, David (1464) | Won 2-1 | +171529 |
| 2legacy | 349 | Rast, Samson (1445) | Lost 1-2 | -201509 |
| 3legacy | 476 | South, Tyler (1544) | Lost 0-2 | -171492 |
| 4legacy | 577 | Gerou, Philip (1487) | Won 2-1 | +181510 |
| 5legacy | 600 | Crawford, Matthew (1553) | Won 2-1 | +191529 |
| 6legacy | 245 | Guan, Thomas Zhennan (1576) | Won 2-0 | +191548 |
| 7legacy | 323 | Sasser, Drake (1737) | Won 2-1 | +211569 |
| 8legacy | 155 | Gonzales, Will (1684) | Won 2-0 | +201589 |
| 9legacy | 1151 | Schlichting, Bill (1600) | Lost 0-2 | -181571 |
| 10legacy | 1133 | Rodriguez, Franky (1606) | Lost 1-2 | -171554 |
| top | average opponent: 1570record: 6-4 | new rating: 1554 | ||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1512 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 357 | Shafer, Clayton (1591) | Lost 1-2 | -161496 |
| 2sealed | 309 | Guenther, Darren (1482) | Won 2-0 | +181514 |
| 3sealed | 331 | Rice, Kevin (1548) | Lost 1-2 | -181496 |
| 4sealed | 301 | Morales, Nicholas (1482) | Won 2-0 | +181514 |
| 5sealed | 285 | Harrison, Jeffrey (1519) | Won 2-1 | +181532 |
| 6sealed | 191 | Lapin, Alex (1408) | Lost 0-2 | -201512 |
| top | average opponent: 1505record: 3-3 | new rating: 1512 | ||
| Grand Prix Toronto 2010 (SOM limited) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 471 | Bushard, Ryan (1530) | Won 2-0 | +191471 |
| 3sealed | 384 | Schinkel, Scott A (1538) | Won 2-0 | +191490 |
| 4sealed | 380 | Massey, Sebastian (1506) | Won 2-0 | +191509 |
| 5sealed | 359 | Bye, Christopher (1578) | Won 2-0 | +191528 |
| 6sealed | 338 | Baxter, Jeff (1540) | Lost 0-2 | -181510 |
| 7sealed | 346 | Kuo, Tzu-Ching (1973) | Lost 0-2 | -101500 |
| 8sealed | 390 | Sperling, Matthew (1938) | Won 2-1 | +261526 |
| 9sealed | 348 | Muraca, Nick (1792) | Lost 0-2 | -141512 |
| top | average opponent: 1674record: 5-3 | new rating: 1512 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 91 | Dillich, Frank R (1500) | Lost 0-2 | -171470 |
| 2sealed | 270 | Race, Allan (1484) | Lost 0-2 | -181452 |
| top | average opponent: 1492record: 0-2 | new rating: 1452 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 254 | Webb, Jay (1463) | Won 2-1 | +171502 |
| 3legacy | 166 | Hickerson, Jonathan (1518) | Draw 1-1 | +11503 |
| 4legacy | 142 | Carpenter, Brad (1497) | Won 2-1 | +181521 |
| 5legacy | 71 | Kellaher, Pat (1552) | Lost 0-2 | -181503 |
| 6legacy | 159 | Chang, Roland (1536) | Draw 1-1 | +11504 |
| 7legacy | 242 | Moretz, Joseph (1589) | Lost 0-2 | -171487 |
| top | average opponent: 1526record: 2-2-2 | new rating: 1487 | ||
| Grand Prix New Jersey 2006 (TSP limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 82 | Mahler, Hans (1593) | Lost 0-2 | -161484 |
| 2sealed | 351 | Frezza, Michael A (1482) | Won 2-1 | +181502 |
| 3sealed | 195 | Cogley, Nick (1562) | Lost 0-2 | -171485 |
| top | average opponent: 1546record: 1-2 | new rating: 1485 | ||