Hammaker, Joe
Current rating: 1424
| Grand Prix Pittsburgh 2015 (modern) | starting rating: 1432 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 223 | Wamboldt, Kyle (1500) | Lost 0-2 | -171415 |
| 2modern | 879 | George, Timothy (1611) | Lost 1-2 | -141401 |
| 3modern | 1119 | Ouimette, Justin (1475) | Won 2-0 | +191420 |
| 4modern | 883 | Dunn, James (1503) | Won 2-0 | +201440 |
| 5modern | 933 | Eveland, James (1566) | Lost 1-2 | -161424 |
| top | average opponent: 1531record: 2-3 | new rating: 1424 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 81 | Seale, Brian (1500) | Won 2-0 | +191484 |
| 2legacy | 57 | Bundens, Justin (1607) | Lost 0-2 | -161468 |
| 3legacy | 420 | Hardenberger, Bryan (1430) | Lost 1-2 | -191449 |
| 4legacy | 474 | Brass, Hayden (1482) | Lost 0-2 | -171432 |
| top | average opponent: 1505record: 1-3 | new rating: 1432 | ||
| Grand Prix Cincinnati 2014 (BNG standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 509 | O'Hara, Daniel (1508) | Won 2-0 | +181518 |
| 2standard | 308 | Martinez, Rick (1584) | Lost 0-2 | -171501 |
| 3standard | 598 | Stalsberg, Chase (1501) | Lost 1-2 | -181483 |
| 4standard | 586 | Antonius, Zac (1482) | Lost 1-2 | -181465 |
| top | average opponent: 1519record: 1-3 | new rating: 1465 | ||