Portofee, Marcus
Current rating: 1533
| Grand Prix Kansas City 2019 (WAR standard) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 187 | McGinnis, Joshua (1414) | Won 2-1 | +161573 |
| 2standard | 35 | Lowery, Skyler (1647) | Lost 1-2 | -171556 |
| 3standard | 205 | Lorik, Robi (1501) | Won 2-0 | +171573 |
| 4standard | 248 | Poniatowski, Steve (1530) | Lost 0-0 | -191554 |
| 5standard | 244 | Rainforth, Chandler (1388) | Lost 0-2 | -211533 |
| top | average opponent: 1496record: 2-3 | new rating: 1533 | ||
| Grand Prix Seattle 2018 (standard) (RIX standard) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 417 | Hunter, John (1500) | Won 2-0 | +171534 |
| 2standard | 181 | Gracia, Connor (1630) | Won 2-1 | +201554 |
| 3standard | 200 | D'Aniello, Francesco (1572) | Lost 1-2 | -181536 |
| 4standard | 209 | Crawford, Matthew (1549) | Won 2-1 | +181554 |
| 5standard | 246 | Job, Jonathan (1823) | Lost 1-2 | -131541 |
| 6standard | 363 | Sosa, Julian (1525) | Won 2-0 | +181559 |
| 7standard | 308 | Flores, Jeremy (1489) | Lost 0-2 | -191540 |
| 8standard | 261 | Phillips Jr, Robert (1514) | Won 2-0 | +171557 |
| top | average opponent: 1575record: 5-3 | new rating: 1557 | ||
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 107 | Hinkle, Louis (1500) | Lost 0-2 | -181482 |
| 2sealed | 239 | Harden, Brandon (1481) | Won 2-0 | +181500 |
| 3sealed | 326 | Shorts, Daniel (1498) | Won 2-1 | +181518 |
| 4sealed | 123 | O'Connell, Michael (1562) | Won 2-0 | +191537 |
| 5sealed | 92 | LaMunyon, Josh (1575) | Won 2-0 | +181555 |
| 6sealed | 54 | Sifuentes, Francisco (1931) | Lost 1-2 | -111544 |
| 7sealed | 95 | Guerra, Ricardo [MEX] (1628) | Lost 1-2 | -161528 |
| 8sealed | 149 | Rivera, Tim (1932) | Lost 1-2 | -111517 |
| top | average opponent: 1638record: 4-4 | new rating: 1517 | ||