Johnston, Roy
Current rating: 1439
Record: 5-9-1
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 81 | Becerra, Ezekiel (1500) | Won 2-1 | +191464 |
| 2sealed | 28 | Komsky, Stan (1814) | Lost 0-2 | -111453 |
| 3sealed | 321 | Ribgy, Dwight (1499) | Lost 0-2 | -181435 |
| 4sealed | 413 | Judd, Sean (1480) | Lost 1-2 | -171418 |
| 5sealed | 386 | Crawford, Connor (1466) | Won 2-0 | +191437 |
| 6sealed | 308 | Scafidi, Frank (1482) | Won 2-0 | +191456 |
| 7sealed | 225 | Hudson, Brian (1500) | Won 2-0 | +191475 |
| 8sealed | 153 | Ogami, Kenneth (1541) | Lost 0-2 | -171458 |
| 9sealed | 132 | Brown, Michael (1415) | Lost 0-2 | -191439 |
| average opponent: 1522record: 4-5 | new rating: 1439 | |||
| Grand Prix Las Vegas 2013 (MMA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1361 | Brown, Stephen (1445) | Lost 1-2 | -191481 |
| 2sealed | 1617 | Armstrong, Sean (1482) | Lost 0-2 | -181463 |
| 3sealed | 1476 | Ellis-Adams, William (1464) | Lost 0-2 | -181445 |
| 4sealed | 1716 | Marlin, Greg (1446) | Won 2-0 | +181463 |
| 5sealed | 1421 | Adams, James [USA] (1465) | Draw 1-1 | 01463 |
| 6sealed | 1053 | Sheppard, Josh (1484) | Lost 0-2 | -181445 |
| average opponent: 1464record: 1-4-1 | new rating: 1445 | |||