Matthews, Joseph K
Current rating: 1633
Record: 14-7
| Grand Prix Sydney 2010 (SOM limited) | starting rating: 1538 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 107 | Edie, Matthew (1500) | Won 2-1 | +181556 |
| 2sealed | 7 | Griffiths, Steven T (1518) | Won 2-0 | +171573 |
| 3sealed | 11 | Lee, Hong-Yang (1534) | Won 2-1 | +171590 |
| 4sealed | 49 | Swannack, Cole (1581) | Won 2-0 | +181608 |
| 5sealed | 20 | Fung, Chris (1472) | Won 2-0 | +161624 |
| 6sealed | 4 | Puszet, Jarron (1584) | Lost 1-2 | -191605 |
| 7sealed | 9 | Kuo, Tzu-Ching (1970) | Lost 0-2 | -121593 |
| 8sealed | 24 | Swords, Chester (1641) | Won 2-1 | +191612 |
| 10draft | 9 | Denz, John (1566) | Won 2-0 | +171629 |
| 11draft | 33 | Tanahashi, Masayasu (1825) | Lost 0-2 | -141615 |
| 12draft | 19 | Roffey, Benjamin (1572) | Won 2-1 | +171632 |
| 13draft | 20 | Richards, Scott (1703) | Lost 0-2 | -171615 |
| 14draft | 1 | Lee, Hong-Yang (1583) | Won 2-0 | +181633 |
| average opponent: 1619record: 9-4 | new rating: 1633 | |||
| Grand Prix Melbourne 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 113 | Ioannidis, Adam (1500) | Lost 1-2 | -181482 |
| 2sealed | 121 | Waylen-Spall, Barry (1482) | Won 2-1 | +181500 |
| 3sealed | 113 | Gloss, Nicolas P (1500) | Won 2-0 | +181518 |
| 4sealed | 91 | Rimmer, Adrian (1530) | Lost 0-2 | -181500 |
| 5sealed | 109 | Ling, Samuel (1499) | Won 2-0 | +181518 |
| 6sealed | 69 | Purdom, Anthony (1637) | Won 2-0 | +201538 |
| 7sealed | 45 | Bates, Simon (1539) | Won 2-0 | +181556 |
| 8sealed | 26 | Wai, Haw Chuan (1555) | Lost 1-2 | -181538 |
| average opponent: 1530record: 5-3 | new rating: 1538 | |||