Gerken, Mark J
Current rating: 1542
Record: 8-6
| Grand Prix Kansas City 2008 (ALA limited) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 112 | Erwin, Adam (1544) | Won 2-1 | +181539 |
| 2sealed | 163 | Anton, Alexander (1465) | Lost 0-2 | -191520 |
| 3sealed | 258 | Hambrick, Geoffrey (1536) | Won 2-1 | +181538 |
| 4sealed | 224 | Meyerson, Jeffrey (1618) | Won 2-0 | +201558 |
| 5sealed | 109 | Lempicki, Elizabeth (1706) | Lost 0-2 | -161542 |
| average opponent: 1574record: 3-2 | new rating: 1542 | |||
| Grand Prix Dallas 2007 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 211 | Gilgenbach, Simon (1500) | Lost 0-2 | -181482 |
| 2extended | 279 | Tams, Jason (1486) | Won 2-0 | +181500 |
| 3extended | 245 | Simmons, Brandon (1463) | Won 0-0 | +171517 |
| 4extended | 226 | Glanz, Kris I (1517) | Won 2-1 | +181535 |
| 5extended | 101 | Huang, Derek C (1616) | Lost 0-2 | -161519 |
| 6extended | 156 | Tirado, Yefte (1523) | Lost 1-2 | -181501 |
| 7extended | 165 | Liberto, Lance (1500) | Won 2-0 | +181519 |
| 8extended | 120 | Cook, Richard (1629) | Lost 1-2 | -161503 |
| 9extended | 101 | Echavarria, Carlos (1499) | Won 2-0 | +181521 |
| average opponent: 1526record: 5-4 | new rating: 1521 | |||