Johnson, Mark 2438
Current rating: 1546
| Grand Prix Oakland 2019 (modern) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 204 | Chhauy, Chamrong (1616) | Won 2-0 | +191561 |
| 2modern | 220 | Bosecker, James (1515) | Won 2-0 | +171578 |
| 3modern | 148 | Hughes, Michael (1705) | Lost 0-2 | -151563 |
| 4modern | 214 | Givarz, Glen (1529) | Lost 1-2 | -191544 |
| 5modern | 299 | Tani, Ken (1500) | Won 2-1 | +171561 |
| 6modern | 314 | dela Cruz, Jimmy (1698) | Lost 0-2 | -151546 |
| 7modern | 277 | Czyzewski, Shane (1564) | Lost 1-2 | -181528 |
| 8modern | 242 | Balagot, Stefan (1533) | Won 2-0 | +181546 |
| top | average opponent: 1583record: 4-4 | new rating: 1546 | ||
| Grand Prix Los Angeles 2018 (M19 standard) | starting rating: 1494 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 19 | Whaley, Connor (1318) | Won 2-0 | +151509 |
| 2standard | 141 | Horn, Lee (1755) | Won 2-1 | +221531 |
| 3standard | 1 | Horspool, Tyler (1866) | Lost 1-2 | -121519 |
| 4standard | 189 | Kim, Austin (1636) | Lost 0-2 | -161503 |
| 5standard | 346 | Lin, Jasmine (1538) | Won 2-0 | +191522 |
| 6standard | 278 | Wan, Tingfeng (1552) | Lost 0-2 | -181504 |
| 7standard | 264 | Neumann, Thomas (1517) | Won 2-1 | +191523 |
| 8standard | 195 | Gaines, Tyler Jo (1596) | Won 2-1 | +191542 |
| top | average opponent: 1597record: 5-3 | new rating: 1542 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 139 | Tinney, Bradley (1815) | Lost 1-2 | -121488 |
| 3modern | 2155 | Bird, Jonathan (1398) | Lost 1-2 | -201468 |
| 4modern | 1228 | Wise, Nicholas (1623) | Won 2-1 | +211489 |
| 5modern | 920 | Chembars, Richard (1599) | Won 2-0 | +201509 |
| 6modern | 767 | Porter, Ben (1675) | Lost 0-2 | -151494 |
| 7modern | 967 | Cloutier, Chuck (1492) | Won 2-0 | +181512 |
| 8modern | 563 | Smith, Bruce (1528) | Lost 0-2 | -181494 |
| top | average opponent: 1590record: 3-4 | new rating: 1494 | ||