McMahon, James
Current rating: 1469
Record: 24-27-2
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 290 | Liang, Chris (1505) | Won 2-1 | +191484 |
| 2legacy | 254 | Dolata, Krzysztof (1549) | Won 2-1 | +191503 |
| 3legacy | 171 | Diesel, John (1427) | Lost 1-2 | -191484 |
| 4legacy | 305 | Thacher, Kory (1518) | Draw 1-1 | +11485 |
| 5legacy | 293 | Washington, William (1499) | Won 2-0 | +181503 |
| 6legacy | 174 | Sowar, Eli (1582) | Lost 1-2 | -171486 |
| 7legacy | 274 | Middleton, Greg (1516) | Lost 0-2 | -171469 |
| top | average opponent: 1514record: 3-3-1 | new rating: 1469 | ||
| Grand Prix Washington DC 2014 (JOU limited) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 179 | McGee, Michael (1732) | Lost 0-2 | -141499 |
| 2sealed | 398 | Oro Yu, Ivan (1573) | Lost 0-2 | -171482 |
| 3sealed | 595 | Naze, Marcin (1546) | Lost 0-2 | -171465 |
| top | average opponent: 1617record: 0-3 | new rating: 1465 | ||
| Grand Prix Atlanta 2014 (JOU limited) | starting rating: 1492 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 237 | Hicks, Zac R (1412) | Won 2-1 | +161508 |
| 2sealed | 292 | Garrison, William (1539) | Won 2-1 | +191527 |
| 3sealed | 298 | Yoon, Joseph (1538) | Lost 0-2 | -181509 |
| 4sealed | 580 | Baxter, James (1529) | Lost 0-2 | -181491 |
| 5sealed | 667 | Griffin, Ellis (1538) | Won 2-0 | +191510 |
| 6sealed | 565 | Koepke, Devin (1686) | Won 2-0 | +211531 |
| 7sealed | 433 | Bulnes, Armando (1506) | Lost 0-2 | -181513 |
| top | average opponent: 1536record: 4-3 | new rating: 1513 | ||
| Grand Prix Philadelphia 2014 (BNG limited) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 64 | Opperman, Chris (1500) | Lost 0-2 | -171455 |
| 2sealed | 504 | Mohammed, Nicholas (1481) | Won 2-0 | +181473 |
| 3sealed | 561 | Glassmacher, Alex (1365) | Won 2-1 | +161489 |
| 4sealed | 549 | Calderon, Christopher (1486) | Won 2-0 | +181507 |
| 5sealed | 351 | Lebel, Maxime (1572) | Lost 1-2 | -171490 |
| 6sealed | 495 | Sudendorf, Vanessa (1537) | Won 2-1 | +191509 |
| 7sealed | 241 | Zung, Stacy (1540) | Lost 0-2 | -171492 |
| top | average opponent: 1497record: 4-3 | new rating: 1492 | ||
| Grand Prix Washington DC 2013 (legacy) | starting rating: 1494 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 62 | Linford, Brian (1500) | Won 2-1 | +181512 |
| 2legacy | 88 | Jennings, Dylan (1481) | Lost 0-2 | -191493 |
| 3legacy | 470 | Mullin, Zack (1460) | Won 2-1 | +181511 |
| 4legacy | 312 | Sweeney, Jace (1399) | Lost 0-2 | -201491 |
| 5legacy | 208 | Bennett, James [USA] (1465) | Lost 0-2 | -191472 |
| top | average opponent: 1461record: 2-3 | new rating: 1472 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 223 | Krueger, Steve (1517) | Won 2-1 | +181532 |
| 2modern | 101 | Mozden, Joshua (1482) | Lost 1-2 | -191513 |
| 3modern | 369 | Hawron, Richard (1482) | Draw 1-1 | 01513 |
| 4modern | 358 | Long, Josh (1469) | Lost 0-2 | -191494 |
| top | average opponent: 1488record: 1-2-1 | new rating: 1494 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 415 | Cheung, Vincent Y (1518) | Won 2-0 | +181551 |
| 3sealed | 481 | Naidu, Akash (1536) | Lost 0-2 | -191532 |
| 4sealed | 612 | Brown, Travis (1518) | Lost 1-2 | -181514 |
| top | average opponent: 1524record: 1-2 | new rating: 1514 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 121 | Hicks, Carson (1500) | Won 2-1 | +181485 |
| 2legacy | 242 | Overturf, Ryan (1518) | Lost 0-2 | -171468 |
| 3legacy | 361 | Marucci, Joe (1499) | Won 2-0 | +191487 |
| 4legacy | 362 | Price, Pat (1548) | Won 2-0 | +191506 |
| 5legacy | 222 | Farrer, Tom (1607) | Won 2-0 | +191525 |
| 6legacy | 53 | Roxas, Jesus (1504) | Won 2-1 | +181543 |
| 7legacy | 42 | Tsao, Dennis (1678) | Won 2-0 | +211564 |
| 8legacy | 47 | McCarthy, Jimmy (1620) | Lost 1-2 | -171547 |
| 9legacy | 76 | Shay, Rich (1780) | Lost 1-2 | -141533 |
| top | average opponent: 1584record: 6-3 | new rating: 1533 | ||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 204 | Blackburn, James (1518) | Won 2-0 | +191484 |
| 3sealed | 37 | Dittert, Jon R (1509) | Won 2-1 | +181502 |
| 4sealed | 64 | Johnson, Michael (1448) | Lost 0-2 | -191483 |
| 5sealed | 120 | Jordan, Michael B (1554) | Lost 0-2 | -161467 |
| top | average opponent: 1507record: 2-2 | new rating: 1467 | ||
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 64 | Torres, Ivan (1523) | Won 2-1 | +181518 |
| 2extended | 121 | Parsinitz, Ralph (1518) | Lost 0-2 | -181500 |
| 3extended | 315 | Long, James (1536) | Lost 0-2 | -171483 |
| 4extended | 345 | Newman, Michael (1482) | Lost 0-2 | -181465 |
| top | average opponent: 1515record: 1-3 | new rating: 1465 | ||