Prehn, John
Current rating: 1461
Record: 1-3
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 229 | Singleton, Chris (1397) | Lost 0-2 | -201480 |
| 2sealed | 255 | Clarke, Max (1482) | Won 2-1 | +181498 |
| 3sealed | 313 | Hanson, William (1518) | Lost 0-2 | -171481 |
| 4sealed | 300 | Kirwan, Stephen (1400) | Lost 0-2 | -201461 |
| average opponent: 1449record: 1-3 | new rating: 1461 | |||