Herdy, John
Current rating: 1482
Record: 4-5
| Grand Prix Tampa 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 27 | Barros, Rodolfo (1500) | Won 2-1 | +181518 |
| 2sealed | 75 | Solorzano, Michaelle (1486) | Lost 0-2 | -191499 |
| 3sealed | 157 | Foster, Jeph (1500) | Won 2-0 | +181517 |
| 4sealed | 225 | Halpren, Ben (1468) | Lost 0-2 | -181499 |
| 5sealed | 285 | Dismukes, Trey (1617) | Won 2-1 | +201519 |
| 6sealed | 140 | Osyda, Eric (1530) | Lost 1-2 | -181501 |
| 7sealed | 210 | Babson, McCray (1433) | Won 2-0 | +171518 |
| 8sealed | 150 | Von Hoff, Niel (1517) | Lost 0-2 | -181500 |
| 9sealed | 147 | Wing, Daryl (1502) | Lost 1-2 | -181482 |
| average opponent: 1506record: 4-5 | new rating: 1482 | |||