Jefferies, Mark
Current rating: 1481
Record: 3-4
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 461 | Lewis, Jon-Michael (1554) | Lost 0-2 | -171499 |
| 2sealed | 587 | Ampier, Stephen (1481) | Lost 0-2 | -181481 |
| average opponent: 1518record: 0-2 | new rating: 1481 | |||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 120 | Mitchell, Don (1500) | Won 2-0 | +181518 |
| 2sealed | 187 | Porras, Tony (1518) | Lost 0-2 | -181500 |
| 3sealed | 328 | Vogel, Peter (1402) | Won 2-0 | +161516 |
| 4sealed | 317 | Bamann, William (1499) | Won 2-0 | +181534 |
| 5sealed | 115 | Lobo Botero, Victor Manuel (1565) | Lost 0-2 | -181516 |
| average opponent: 1497record: 3-2 | new rating: 1516 | |||