Umamoto, Derek
Current rating: 1661
Record: 30-17-1 (GP) / 3-5 (professional)
| Grand Prix Las Vegas 2018 (modern) (modern) | starting rating: 1639 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 632 | McCue, Spencer (1515) | Won 2-0 | +161655 |
| 2modern | 396 | Saari, Baron (1489) | Won 2-1 | +151670 |
| 3modern | 1336 | Andrades, Kevin (1535) | Won 2-1 | +151685 |
| 4modern | 53 | Nuccio, John (1457) | Won 2-0 | +141699 |
| 5modern | 1303 | Gilison, Daniel (1596) | Lost 1-2 | -201679 |
| 6modern | 100 | Auger, Maxime (1943) | Lost 0-2 | -131666 |
| 7modern | 325 | Santos, Jorge (1607) | Won 2-0 | +171683 |
| 8modern | 295 | Reed, Chris (1483) | Lost 0-2 | -221661 |
| top | average opponent: 1578record: 5-3 | new rating: 1661 | ||
| Grand Prix Albuquerque 2016 (SOI limited) | starting rating: 1633 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 385 | Cruse, David (1627) | Lost 0-2 | -181615 |
| 2sealed | 452 | Fisher, Ashten (1520) | Lost 0-2 | -191596 |
| 3sealed | 577 | Brock, Michael (1425) | Won 2-0 | +141610 |
| 4sealed | 484 | Brent, Ryan (1480) | Won 2-0 | +161626 |
| 5sealed | 324 | Osburn, Travis (1500) | Won 2-0 | +161642 |
| 6sealed | 272 | Weitz, Benjamin (1985) | Lost 1-2 | -121630 |
| 7sealed | 284 | Wendel, Nathan (1506) | Won 2-1 | +161646 |
| 8sealed | 308 | Salvador, Griffin (1530) | Won 2-1 | +151661 |
| 9sealed | 201 | Houston, Zane (1627) | Won 2-1 | +181679 |
| 10draft | 176 | Kennedy, Cory (1589) | Lost 0-2 | -201659 |
| 11draft | 136 | Nelson, Colleen (1542) | Lost 0-2 | -201639 |
| top | average opponent: 1575record: 6-5 | new rating: 1639 | ||
| Grand Prix Albuquerque 2013 (THS standard) | starting rating: 1652 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 126 | Pommer, Dylan (1500) | Won 2-0 | +151667 |
| 2standard | 218 | Bahr, Michael (1518) | Lost 0-2 | -211646 |
| 3standard | 288 | Rosales, Randy (1556) | Won 2-0 | +171663 |
| 4standard | 352 | Salamat, Amir (1635) | Won 2-0 | +171680 |
| 5standard | 176 | Staunton, Courtney (1517) | Lost 0-2 | -211659 |
| 6standard | 307 | Miller, Ty (1462) | Won 2-1 | +151674 |
| 7standard | 217 | Molina, Cody (1585) | Lost 1-2 | -201654 |
| 8standard | 292 | Mosij, Jeremiah (1516) | Lost 0-2 | -211633 |
| top | average opponent: 1536record: 4-4 | new rating: 1633 | ||
| Pro Tour Honolulu 2009 (Alara block) | starting rating: 1681 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 164 | Porojan, Raul (1879) | Won 2-0 | +211702 |
| 2block | 60 | Hegstad, Brian (1846) | Lost 1-2 | -151687 |
| 3block | 98 | Mygh, Sebastian (1742) | Won 2-1 | +191706 |
| 4block | 48 | Johannsen, Dennis (1728) | Lost 1-2 | -181688 |
| 5block | 120 | Sirilertvorakul, Veerapat (1670) | Lost 0-2 | -181670 |
| 6draft | 71 | Severin, Thoralf (1592) | Won 2-1 | +171687 |
| 7draft | 34 | Carleton-Barnes, Gabriel (1750) | Lost 0-2 | -171670 |
| 8draft | 105 | Reitbauer, David (1662) | Lost 0-2 | -181652 |
| top | average opponent: 1734record: 3-5 | new rating: 1652 | ||
| Grand Prix Los Angeles 2009 (extended) | starting rating: 1557 | |||
| round | table | opponent (rating) | result | Δrating |
| 3extended | 34 | Nyberg, Andrew (1516) | Won 2-1 | +181575 |
| 4extended | 22 | Catterall-Davis, Merlin (1609) | Lost 1-2 | -181557 |
| 5extended | 142 | Ong, Wei Jian (1527) | Won 2-0 | +181575 |
| 6extended | 47 | Schaller, Eric (1545) | Won 2-0 | +171592 |
| 7extended | 56 | Anderson, Sean P (1564) | Lost 0-2 | -181574 |
| 8extended | 63 | Ronquillo, Ramoncito D (1511) | Won 2-0 | +171591 |
| 9extended | 54 | Jones, Anders (1569) | Won 2-0 | +171608 |
| 10extended | 30 | Balla, John (1747) | Won 2-0 | +211629 |
| 11extended | 17 | Gray, Andrew (1570) | Won 2-1 | +171646 |
| 12extended | 15 | Hague, Matt (1584) | Won 2-1 | +161662 |
| 13extended | 9 | Romao, Carlos (1796) | Won 2-0 | +211683 |
| 14extended | 4 | Hendrix, Carl (1646) | Lost 1-2 | -191664 |
| 15extended | 11 | Ruiz, Joey (1584) | Won 2-1 | +171681 |
| top | average opponent: 1598record: 10-3 | new rating: 1681 | ||
| Grand Prix Denver 2008 (Lorwyn block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 107 | Mok, Wilson (1524) | Won 2-1 | +181518 |
| 3block | 10 | Martell, Tom (1734) | Draw 1-1 | +41522 |
| 4block | 83 | Cowan, Russell (1550) | Won 2-0 | +191541 |
| 5block | 41 | Wise, Nick (1455) | Lost 1-2 | -201521 |
| 6block | 94 | Boothby, Kasandra L (1537) | Won 2-0 | +191540 |
| 7block | 57 | Salva, Grahm (1537) | Lost 0-2 | -191521 |
| 8block | 95 | Martinez, Thomas J (1517) | Won 2-0 | +181539 |
| 9block | 65 | Wharton, Jeffrey (1540) | Won 2-0 | +181557 |
| top | average opponent: 1549record: 5-2-1 | new rating: 1557 | ||