Harper, Mason
Current rating: 1541
Record: 15-13
| Grand Prix Portland 2018 (modern) | starting rating: 1555 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 250 | Turner, Bobby (1461) | Lost 1-2 | -201535 |
| 2modern | 570 | Peltola, Jason (1330) | Won 2-1 | +151550 |
| 3modern | 384 | Rhoades, Evan (1280) | Lost 1-2 | -231527 |
| 4modern | 625 | Daley, William (1481) | Won 2-0 | +171544 |
| 5modern | 400 | McKeague-Foster, Michael (1496) | Lost 0-2 | -191525 |
| 6modern | 567 | Ferrante, Drew (1409) | Won 2-1 | +161541 |
| top | average opponent: 1410record: 3-3 | new rating: 1541 | ||
| Grand Prix Las Vegas 2018 (modern) (modern) | starting rating: 1556 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 237 | Dumlao, Gary (1569) | Lost 0-2 | -181538 |
| 2modern | 741 | Berkshire, Daniel (1483) | Won 2-1 | +171555 |
| top | average opponent: 1526record: 1-1 | new rating: 1555 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 478 | Berry, Josh (1409) | Won 2-0 | +181463 |
| 2modern | 581 | Garrison, Justin (1546) | Won 2-0 | +191482 |
| 3modern | 355 | Withers, Matthew (1442) | Won 2-1 | +171499 |
| 4modern | 40 | Fox, Darren Joshua (1478) | Won 2-1 | +181517 |
| 5modern | 188 | Reuschel, Carl (1515) | Lost 0-2 | -181499 |
| 6modern | 262 | Day, Michael (1514) | Lost 1-2 | -181481 |
| 7modern | 436 | Mason, Donald (1522) | Won 2-1 | +191500 |
| 8modern | 181 | Lav, Marvin (1480) | Won 2-0 | +181518 |
| 9modern | 159 | Nash, William (1535) | Won 2-0 | +181536 |
| 10modern | 211 | Bernat, Michael (1834) | Lost 1-2 | -131523 |
| 11modern | 210 | Field, Scott (1542) | Won 2-0 | +191542 |
| 12modern | 109 | Littman, Fai (1939) | Lost 0-2 | -121530 |
| 13modern | 209 | Anghelescu, Jonathan (1857) | Lost 0-2 | -121518 |
| 14modern | 286 | Haker, Steven (1530) | Won 2-1 | +181536 |
| 15modern | 231 | Switzer, Paul (1607) | Won 2-0 | +201556 |
| top | average opponent: 1583record: 10-5 | new rating: 1556 | ||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 94 | Phan, Peter (1500) | Lost 0-2 | -181482 |
| 2sealed | 202 | Cedilla, Nate (1482) | Won 2-0 | +181500 |
| 3sealed | 193 | McDaniel, Whit (1467) | Lost 0-2 | -191481 |
| 4sealed | 271 | Faulkner, Clayton (1482) | Lost 0-2 | -181463 |
| 5sealed | 245 | Mowery, Sterling (1460) | Lost 0-2 | -181445 |
| top | average opponent: 1478record: 1-4 | new rating: 1445 | ||