Sperka, John
Current rating: 1491
Record: 7-9
| Grand Prix Memphis 2019 (RNA standard) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 93 | Methvin, Ray (1500) | Won 2-0 | +171540 |
| 2standard | 30 | Hamilton, Michael (1875) | Lost 0-2 | -121528 |
| 3standard | 263 | Sanders, Blake (1480) | Lost 0-2 | -191509 |
| 4standard | 365 | Horberg, Erik (1482) | Lost 0-2 | -181491 |
| average opponent: 1584record: 1-3 | new rating: 1491 | |||
| Grand Prix Memphis 2018 (RIX standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 255 | Householder, Nicholas (1500) | Won 2-0 | +181518 |
| 2standard | 90 | Nossett, Miles (1448) | Won 2-0 | +171535 |
| 3standard | 252 | Burton, Brandon (1696) | Won 2-1 | +211556 |
| 4standard | 17 | Stanton, Mark (1649) | Lost 1-2 | -171539 |
| 5standard | 227 | Mullin, Geoff (1630) | Won 2-0 | +201559 |
| 6standard | 44 | Davis, Shawn (1635) | Won 2-1 | +191578 |
| 7standard | 40 | Joseph, Leon (1759) | Won 2-1 | +221600 |
| 8standard | 41 | Medley, Jacob (1729) | Lost 0-2 | -161584 |
| 9standard | 106 | Anderson, Todd (1892) | Lost 0-2 | -131571 |
| 10standard | 91 | Macaraeg, Tad (1783) | Lost 0-2 | -141557 |
| 11standard | 99 | Noonan, Christopher (1627) | Lost 0-2 | -171540 |
| 12standard | 100 | Martinez, Etienne (1550) | Lost 0-2 | -171523 |
| average opponent: 1658record: 6-6 | new rating: 1523 | |||