Marks, Jacob
Current rating: 1432
Record: 2-6
| Grand Prix Columbus 2019 (modern) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 8 | Levy, Andrew (1500) | Lost 0-2 | -171428 |
| 2modern | 222 | Johnson, Harlan (1483) | Won 2-0 | +191447 |
| 3modern | 169 | Stewart, Michael (1644) | Lost 0-2 | -141433 |
| 4modern | 287 | Knapp, Shawn (1509) | Won 2-0 | +191452 |
| 5modern | 158 | Hennessey, Connor (1324) | Lost 1-2 | -201432 |
| average opponent: 1492record: 2-3 | new rating: 1432 | |||
| Grand Prix Atlantic City 2015 (DTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 509 | Smith, Chris M (1500) | Lost 0-2 | -181482 |
| 2sealed | 623 | Trevisan, Theodore (1455) | Lost 0-2 | -181464 |
| 3sealed | 753 | Rapoport, Paul (1445) | Lost 0-2 | -191445 |
| average opponent: 1467record: 0-3 | new rating: 1445 | |||