Johnson, Mark S
Current rating: 1507
Record: 2-2
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 209 | Hoffman, Evan (1500) | Won 2-0 | +181518 |
| 2sealed | 199 | Truong, Michael (1518) | Won 2-1 | +181536 |
| 3sealed | 5 | Roberts, Brock (1730) | Lost 0-2 | -151521 |
| 4sealed | 142 | Blanchard, Wes (1741) | Lost 1-2 | -141507 |
| average opponent: 1622record: 2-2 | new rating: 1507 | |||