Marsh, Corwin
Current rating: 1626
Record: 19-13-1 (GP) / 3-3 (professional)
| Grand Prix Seattle-Tacoma 2012 (DKA limited) | starting rating: 1641 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 9 | Goodman-Peavy, Joshua (1500) | Lost 1-2 | -201621 |
| 2sealed | 413 | Preuss, Derek (1482) | Lost 0-2 | -211600 |
| 3sealed | 483 | soeung, raymond (1464) | Won 2-1 | +161616 |
| 4sealed | 474 | Storbeck, Kirby R (1482) | Won 2-0 | +151631 |
| 5sealed | 284 | Hsieh, Calvin (1498) | Won 2-1 | +161647 |
| 6sealed | 333 | Moses, Chad (1484) | Lost 0-2 | -211626 |
| top | average opponent: 1485record: 3-3 | new rating: 1626 | ||
| Grand Prix Seattle 2005 (extended) | starting rating: 1543 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 95 | Zorn, Peter (1530) | Lost 0-2 | -191524 |
| 3extended | 114 | Dolbeer, Jed (1425) | Won 2-1 | +171541 |
| 4extended | 103 | Gray, Jason (1500) | Won 2-0 | +171558 |
| 5extended | 42 | Lunsford, Alan (1596) | Won 2-0 | +191577 |
| 6extended | 35 | Green, David (1534) | Won 2-1 | +171594 |
| 7extended | 31 | Durward, Caleb (1572) | Won 2-0 | +171611 |
| 8extended | 13 | Meyer, Chad (1508) | Won 2-1 | +171628 |
| 9extended | 8 | Majlaton, Alex (1541) | Lost 0-2 | -201608 |
| 10extended | 10 | Kret, Adamko (1544) | Won 2-1 | +171625 |
| 11extended | 9 | Angulo, Enrique (1612) | Won 2-1 | +181643 |
| 12extended | 5 | Putnam, Taylor (1610) | Lost 0-2 | -191624 |
| 13extended | 9 | Jefferson, Kyle (1637) | Draw 1-1 | 01624 |
| 14extended | 12 | Durnan, Harry (1577) | Won 2-0 | +171641 |
| top | average opponent: 1553record: 9-3-1 | new rating: 1641 | ||
| Pro Tour San Diego 2004 (DST draft) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 61 | Carvalho, Bruno (1731) | Lost 1-2 | -151503 |
| 2draft | 100 | Ikeda, Tsuyoshi (1781) | Lost 0-2 | -131490 |
| 3draft | 133 | Parker, Brock (1789) | Won 2-1 | +241514 |
| 4draft | 44 | Larson, Matt (1762) | Won 2-1 | +221536 |
| 5draft | 78 | Guarino, Massimo (1736) | Won 2-1 | +221558 |
| 6draft | 51 | Iwai, Tsuyoshi (1724) | Lost 0-2 | -151543 |
| top | average opponent: 1754record: 3-3 | new rating: 1543 | ||
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 95 | Player, Alex (1401) | Won 2-0 | +171499 |
| 3sealed | 9 | Koleczek, Luke (1568) | Won 2-1 | +191518 |
| 4sealed | 41 | Lambert, Eric (1501) | Won 2-0 | +181536 |
| 5sealed | 30 | Caskey, Dan (1576) | Won 2-1 | +191555 |
| 6sealed | 11 | Howard, David (1605) | Lost 1-2 | -181537 |
| 7sealed | 33 | Mays, Rich (1503) | Won 2-1 | +181555 |
| 8sealed | 36 | Wiitanen, Josh (1639) | Won 2-0 | +191574 |
| 9sealed | 10 | Krempels, Craig (1806) | Lost 1-2 | -141560 |
| 10draft | 25 | Sonne, Jonathan (1848) | Lost 1-2 | -121548 |
| 11draft | 45 | Anderson, Eddie (1680) | Lost 1-2 | -161532 |
| 12draft | 54 | King, Stephen (1530) | Won 2-1 | +181550 |
| 13draft | 40 | Gagliardi, Joe (1533) | Lost 1-2 | -181532 |
| 14draft | 47 | Williams, David A (1749) | Lost 0-2 | -141518 |
| top | average opponent: 1611record: 7-6 | new rating: 1518 | ||
| Grand Prix Oakland 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 54 | Adams, Mason (1517) | Lost 1-2 | -181482 |
| top | record: 0-1 | new rating: 1482 | ||