Marshall, Jonathan
Current rating: 1485
Record: 6-7
| Grand Prix Hartford 2018 (modern) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 188 | Pratt, Marcel (1500) | Won 2-1 | +191502 |
| 2modern | 45 | Altman, Amy (1525) | Lost 0-2 | -181484 |
| 3modern | 501 | Caruso, Domenick (1497) | Lost 1-2 | -181466 |
| 4modern | 772 | Bush, Donovan (1483) | Won 2-0 | +191485 |
| 5modern | 544 | Fredrickson, Jeffery (1513) | Lost 1-2 | -181467 |
| 6modern | 544 | Owen, Nicholas (1450) | Won 2-1 | +181485 |
| 7modern | 432 | Klempa, Michael (1499) | Won 2-1 | +181503 |
| 8modern | 377 | Sellick, Adam (1516) | Lost 0-2 | -181485 |
| average opponent: 1498record: 4-4 | new rating: 1485 | |||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 1809 | Jacobus, Michael (1552) | Lost 0-2 | -171483 |
| 2legacy | 1765 | Carnahan, Scot (1519) | Lost 1-2 | -171466 |
| 3legacy | 2032 | Redmond, Kyle (1462) | Won 1-0 | +181484 |
| 4legacy | 1966 | Stout, Darin (1477) | Won 2-0 | +171501 |
| 5legacy | 1762 | Reale, Robert J (1496) | Lost 0-2 | -181483 |
| average opponent: 1501record: 2-3 | new rating: 1483 | |||