Yokoyama, Jonathan
Current rating: 1520
Record: 9-8
| Grand Prix Sacramento 2018 (M19 limited) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 301 | Gundry, Phil (1500) | Won 2-1 | +181532 |
| 2sealed | 210 | Skipwith, Colin (1589) | Lost 1-2 | -171515 |
| 3sealed | 486 | Garnica, Nathan (1488) | Won 2-1 | +181533 |
| 4sealed | 173 | Balles, Domingo (1382) | Won 2-0 | +151548 |
| 5sealed | 221 | Dy, Michael (1626) | Won 2-0 | +191567 |
| 6sealed | 73 | Laughlin, Pierson (1925) | Lost 0-2 | -111556 |
| 7sealed | 184 | Blakeley, Joseph (1482) | Lost 0-2 | -201536 |
| 8sealed | 216 | Silver, Jeffrey (1647) | Lost 0-2 | -161520 |
| average opponent: 1580record: 4-4 | new rating: 1520 | |||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 207 | Brown, Izabel (1500) | Lost 0-2 | -181482 |
| 2standard | 689 | Miller, Dillon (1414) | Lost 0-2 | -191463 |
| 3standard | 760 | Cozzoli, Christopher (1464) | Won 2-1 | +181481 |
| 4standard | 517 | Hopkins, Lizzi (1482) | Won 2-0 | +181499 |
| 5standard | 379 | Swanson, Sam (1584) | Lost 0-2 | -171482 |
| 6standard | 506 | Ploch, Triston (1484) | Won 2-0 | +181500 |
| 7standard | 514 | Politsch, Gabriel (1499) | Won 2-0 | +181518 |
| 8standard | 303 | Hartman, Neil (1450) | Lost 1-2 | -191499 |
| 9standard | 337 | Green, Marcell (1347) | Won 2-0 | +151514 |
| average opponent: 1469record: 5-4 | new rating: 1514 | |||