Marker, David
Current rating: 1470
Record: 5-7
| Grand Prix Niagara Falls 2019 (legacy) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 17 | Wilson, Zach (1500) | Won 2-0 | +191500 |
| 2legacy | 88 | Yeoh, Ken-Min (1643) | Lost 0-2 | -161484 |
| 3legacy | 392 | McIlwaine, Patrick (1667) | Lost 0-2 | -141470 |
| 4legacy | 378 | Restemyer, Samuel (1485) | Won 2-1 | +181488 |
| 5legacy | 350 | Klements, Michael (1524) | Lost 0-2 | -171471 |
| 6legacy | 341 | Kehoe, Michael (1470) | Won 2-0 | +181489 |
| 7legacy | 269 | Estrella, Jeff (1462) | Lost 0-2 | -191470 |
| average opponent: 1536record: 3-4 | new rating: 1470 | |||
| Grand Prix Kansas City 2013 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 28 | Groshong, Brandon (1500) | Lost 0-2 | -181482 |
| 2modern | 359 | Petray, Brad (1482) | Won 2-0 | +181500 |
| 3modern | 309 | Land, Jared (1410) | Won 2-1 | +161516 |
| 4modern | 168 | Crozier, Justin (1523) | Lost 1-2 | -181498 |
| 5modern | 237 | Mendoza, Matt (1551) | Lost 0-2 | -171481 |
| average opponent: 1493record: 2-3 | new rating: 1481 | |||