Colburn, John
Current rating: 1482
Record: 6-7-1
| Grand Prix Oklahoma City 2013 (THS limited) | starting rating: 1479 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 159 | Ruhl, Christopher (1501) | Won 1-0 | +181497 |
| 2sealed | 221 | Haskins, Eric (1500) | Won 2-1 | +181515 |
| 3sealed | 147 | Cash, Brett (1472) | Lost 0-2 | -191496 |
| 4sealed | 285 | Hearn, Grant (1518) | Won 2-0 | +191515 |
| 5sealed | 300 | Papanek, Jesse (1536) | Lost 1-2 | -181497 |
| 6sealed | 369 | Willhoite, Alec (1518) | Won 2-1 | +181515 |
| 7sealed | 209 | Soloway, Joseph (1538) | Lost 1-2 | -171498 |
| 8sealed | 295 | Tendrock, Steven (1592) | Lost 0-2 | -161482 |
| average opponent: 1522record: 4-4 | new rating: 1482 | |||
| Grand Prix Las Vegas 2013 (MMA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1186 | Maldonado, Stephen (1387) | Lost 1-2 | -201480 |
| 2sealed | 1247 | Barraza, Marcelino (1482) | Won 2-0 | +181498 |
| 3sealed | 1169 | Dupre, Alex (1499) | Won 2-0 | +181516 |
| 4sealed | 1095 | Lussier, Dustin (1452) | Lost 0-2 | -191497 |
| 5sealed | 1050 | Wilkinson, George (1473) | Draw 1-1 | -11496 |
| 6sealed | 781 | Mitsuma, Takayuki (1503) | Lost 0-2 | -171479 |
| average opponent: 1466record: 2-3-1 | new rating: 1479 | |||