Garrison, Justin
Current rating: 1468
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1529 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 23 | Sahr, Eric (1485) | Won 2-0 | +171546 |
| 2modern | 581 | Harper, Mason (1463) | Lost 0-2 | -201526 |
| 3modern | 891 | Thorpe, David (1478) | Lost 1-2 | -181508 |
| 4modern | 1233 | Rodriguez, Jesus (1349) | Lost 1-2 | -211487 |
| 5modern | 1332 | Turbeville, James (1464) | Lost 0-2 | -191468 |
| top | average opponent: 1448record: 1-4 | new rating: 1468 | ||
| Grand Prix Detroit 2016 (modern) | starting rating: 1478 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 876 | Arndt, James (1500) | Won 2-0 | +181496 |
| 2modern | 558 | Nwachukwu, Obi (1519) | Lost 0-2 | -181478 |
| 3modern | 836 | Saam, Dominick (1463) | Won 2-0 | +181496 |
| 4modern | 481 | Bryan, Jordan (1552) | Won 2-1 | +191515 |
| 5modern | 230 | Farrar, Jake (1518) | Lost 0-2 | -181497 |
| 6modern | 701 | Alexander, Jason (1490) | Won 2-1 | +181515 |
| 7modern | 308 | Selix, Cody (1533) | Won 2-0 | +181533 |
| 8modern | 199 | Busch, Russell (1678) | Won 2-1 | +211554 |
| 9modern | 189 | Burnett, Kai (1930) | Lost 0-2 | -111543 |
| 10modern | 183 | Lee, Michelle (1770) | Lost 0-2 | -141529 |
| top | average opponent: 1595record: 6-4 | new rating: 1529 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 202 | Perovic, Boban (1500) | Won 2-1 | +181518 |
| 2modern | 237 | Hansen, Josh (1442) | Won 2-1 | +171535 |
| 3modern | 99 | Balderas, Ryan (1455) | Won 2-1 | +161551 |
| 4modern | 99 | Mong, Derek (1466) | Lost 0-2 | -191532 |
| 5modern | 247 | White, Logan (1520) | Lost 1-2 | -191513 |
| 6modern | 295 | Heup, Michael (1556) | Lost 0-2 | -171496 |
| 7modern | 266 | Speer, Brendan (1503) | Won 2-0 | +181514 |
| 8modern | 205 | Koury, Anthony (1520) | Lost 0-2 | -181496 |
| 9modern | 205 | Sagermann, Christian (1454) | Lost 0-2 | -181478 |
| top | average opponent: 1491record: 4-5 | new rating: 1478 | ||