Ko, Jason
Current rating: 1589
Record: 58-54
- 2010
- 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
- 2019
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1597 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 257 | Heckman, Michael (1440) | Won 2-0 | +161613 |
| 2modern | 365 | Law, Calvin (1603) | Lost 1-2 | -191594 |
| 3modern | 656 | Penrod, Jacob (1400) | Won 2-1 | +151609 |
| 4modern | 313 | Macurda, Art (1589) | Lost 0-2 | -191590 |
| 5modern | 535 | Mekaroun, Anousith (1541) | Won 2-0 | +181608 |
| 6modern | 443 | Brezina, Joseph (1564) | Lost 0-2 | -191589 |
| top | average opponent: 1523record: 3-3 | new rating: 1589 | ||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1587 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 246 | Nakamura, Yuki 8131 (1701) | Lost 1-2 | -161571 |
| 3legacy | 376 | Yang, Chen Han (1519) | Lost 0-2 | -191552 |
| 4legacy | 501 | Oguri, Hiroki (1379) | Won 2-0 | +151567 |
| 5legacy | 342 | Imai, Seisuke (1483) | Won 2-0 | +161583 |
| 6legacy | 214 | Shinozawa, Tomohiro (1467) | Lost 1-2 | -201563 |
| 7legacy | 327 | Haga, Tatsuya (1501) | Won 2-0 | +171580 |
| 8legacy | 289 | Tsuruta, Takurou (1543) | Won 2-1 | +171597 |
| top | average opponent: 1514record: 4-3 | new rating: 1597 | ||
| Grand Prix Las Vegas 2018 (modern) (modern) | starting rating: 1607 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 559 | Lewsadder, Brian (1477) | Lost 1-2 | -201587 |
| top | record: 0-1 | new rating: 1587 | ||
| Grand Prix Seattle 2018 (standard) (RIX standard) | starting rating: 1644 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 93 | Cooper, Tyler (1596) | Lost 1-2 | -191625 |
| 2standard | 504 | Miller, James (1618) | Lost 1-2 | -181607 |
| top | average opponent: 1607record: 0-2 | new rating: 1607 | ||
| Grand Prix Seattle 2018 (legacy) (legacy) | starting rating: 1672 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 481 | Coogan, Andrew (1501) | Won 2-1 | +151687 |
| 2legacy | 357 | Salyer, Nicholas (1381) | Lost 1-2 | -241663 |
| 3legacy | 493 | Penney, Joseph (1687) | Won 2-0 | +191682 |
| 4legacy | 451 | Luke, Thomas (1609) | Lost 1-2 | -201662 |
| 5legacy | 578 | Skippen, Will (1657) | Lost 0-2 | -181644 |
| top | average opponent: 1567record: 2-3 | new rating: 1644 | ||
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1715 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 84 | Ricker, Michael (1471) | Lost 1-2 | -221693 |
| 2sealed | 275 | Carrillo Lopez, Arturo Ivan (1505) | Lost 0-2 | -211672 |
| top | average opponent: 1488record: 0-2 | new rating: 1672 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1603 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 33 | Cheng, Zhuoxu (1599) | Won 2-0 | +181621 |
| 2modern | 70 | Ash, Dominick (1413) | Won 2-0 | +141635 |
| 3modern | 310 | Bernett, Evan (1514) | Won 2-0 | +161651 |
| 4modern | 127 | Martinez, Jon (1517) | Won 2-0 | +161667 |
| 5modern | 67 | Vefa, Yusuf Kemal (1926) | Lost 1-2 | -141653 |
| 6modern | 343 | Brizuela, Roland (1535) | Won 2-0 | +161669 |
| 7modern | 176 | Hargrove, Paul (1571) | Won 2-1 | +161685 |
| 8modern | 2111 | Disenborg, Johan (1532) | Won 2-1 | +161701 |
| 9modern | 62 | Brinkman, Garrett (1721) | Won 2-1 | +181719 |
| 10modern | 28 | Royer, Danny (1757) | Lost 0-2 | -171702 |
| 11modern | 115 | Brewer, Robert (1547) | Won 2-1 | +151717 |
| 12modern | 53 | Kastel, Chad (1839) | Lost 1-2 | -161701 |
| 13modern | 114 | Horn, Lee (1740) | Won 2-1 | +191720 |
| 14modern | 45 | Dunn, Jayce (1511) | Won 2-1 | +141734 |
| 15modern | 55 | Sonderland, Daniel (1702) | Lost 0-2 | -191715 |
| top | average opponent: 1628record: 11-4 | new rating: 1715 | ||
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1595 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 507 | McMillan, Alistair (1469) | Won 2-0 | +151610 |
| 2legacy | 157 | Mathews, Andrew (1607) | Lost 1-2 | -181592 |
| 3legacy | 998 | Klainman, Ophir (1484) | Lost 1-2 | -201572 |
| 4legacy | 929 | Cook, Brandon (1440) | Won 2-1 | +161588 |
| 5legacy | 940 | Stoltzfus, Timothy (1451) | Won 2-0 | +151603 |
| 6legacy | 600 | Barrientos Ochoa, Sergio (1532) | Won 2-1 | +171620 |
| 7legacy | 548 | Gareau, Philippe (1677) | Lost 1-2 | -171603 |
| top | average opponent: 1523record: 4-3 | new rating: 1603 | ||
| Grand Prix Dallas-Fort Worth 2016 (modern) | starting rating: 1563 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 678 | Richert, Creigh (1448) | Won 2-0 | +161579 |
| 2modern | 139 | Tatum, Joseph (1531) | Won 2-0 | +171596 |
| 3modern | 32 | Wiznitzer, Aryeh (1828) | Won 2-0 | +221618 |
| 4modern | 207 | Wijaya, Vidianto (1889) | Lost 0-2 | -131605 |
| 5modern | 220 | Seetharam, Aneil (1668) | Lost 1-2 | -171588 |
| 6modern | 518 | Lingelbach, Cody (2008) | Won 2-1 | +261614 |
| 7modern | 316 | Vajda, Andy (1563) | Lost 0-2 | -191595 |
| top | average opponent: 1705record: 4-3 | new rating: 1595 | ||
| Grand Prix Houston 2016 (OGW standard) | starting rating: 1553 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 83 | Hinojosa, Rolaund (1663) | Won 2-1 | +201573 |
| 3standard | 251 | Nelson, Paris (1489) | Won 2-0 | +161589 |
| 4standard | 185 | Lugo, Gabriel (1557) | Lost 1-2 | -181571 |
| 5standard | 281 | Long, Kyle (1504) | Won 2-1 | +171588 |
| 6standard | 81 | Martinez, Rodrigo (1483) | Lost 1-2 | -201568 |
| 7standard | 286 | Dowdy, Aubrey (1603) | Won 2-1 | +181586 |
| 8standard | 104 | Mackl, Valentin (1859) | Lost 1-2 | -131573 |
| 9standard | 270 | Andrew, Ian (1571) | Won 2-1 | +181591 |
| 10standard | 226 | Hwang, Eugene (2012) | Lost 1-2 | -111580 |
| 11standard | 208 | Boehm, Christopher (1624) | Lost 0-2 | -171563 |
| top | average opponent: 1637record: 5-5 | new rating: 1563 | ||
| Grand Prix Oklahoma City 2015 (modern) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 38 | Davis, Zack (1412) | Won 2-0 | +151586 |
| 3modern | 153 | Galles, Matthew (1551) | Won 0-0 | +171603 |
| 4modern | 106 | Drescher, Will (1606) | Lost 1-2 | -181585 |
| 5modern | 201 | Blanchard, Wes (1623) | Lost 0-2 | -171568 |
| 6modern | 367 | Cieszinski, Michael (1729) | Lost 0-2 | -151553 |
| top | average opponent: 1584record: 2-3 | new rating: 1553 | ||
| Grand Prix San Antonio 2014 (KTK standard) | starting rating: 1556 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 249 | Dawson, Christian (1644) | Won 2-1 | +201576 |
| 3standard | 194 | Wiznitzer, Aryeh (1709) | Lost 0-2 | -161560 |
| 4standard | 225 | Stevens, Michael (1321) | Lost 1-2 | -221538 |
| 5standard | 265 | Boileau, Christopher (1503) | Won 2-1 | +171555 |
| 6standard | 298 | Griffin, Mike (1520) | Won 2-0 | +181573 |
| 7standard | 181 | Carter, John (1444) | Won 2-1 | +161589 |
| 8standard | 105 | Humphries, Mickey (1597) | Lost 0-2 | -181571 |
| top | average opponent: 1534record: 4-3 | new rating: 1571 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 898 | Greise, Robert (1547) | Won 2-1 | +181560 |
| 4legacy | 808 | Edelkamp, Fred (1862) | Won 2-0 | +241584 |
| 5legacy | 609 | Cates, Weston (1508) | Lost 0-2 | -201564 |
| 6legacy | 700 | Kotwica, Ron (1789) | Won 2-1 | +221586 |
| 7legacy | 648 | Lloyd, Alex (1813) | Lost 1-2 | -141572 |
| 8legacy | 691 | Istfan, Raeef (1686) | Lost 1-2 | -161556 |
| top | average opponent: 1701record: 3-3 | new rating: 1556 | ||
| Grand Prix Minneapolis 2014 (modern) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 139 | Scamp, Ted (1500) | Won 2-1 | +191503 |
| 2modern | 288 | Strohmayer, Kyle (1481) | Won 2-0 | +171520 |
| 3modern | 238 | Weiser, Daniel (1556) | Won 2-1 | +191539 |
| 4modern | 154 | Johnson, Alex (1632) | Won 2-0 | +201559 |
| 5modern | 141 | Cuenca, Nicolas (1655) | Lost 1-2 | -171542 |
| 6modern | 283 | Quinn, Jeremy (1745) | Won 2-0 | +221564 |
| 7modern | 128 | Burnett, Kai (2016) | Lost 1-2 | -101554 |
| 8modern | 289 | Moral, Carlos (1918) | Lost 1-2 | -121542 |
| top | average opponent: 1688record: 5-3 | new rating: 1542 | ||
| Grand Prix Dallas-Fort Worth 2013 (THS standard) | starting rating: 1543 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 206 | Stilwell, Josh (1500) | Lost 1-2 | -191524 |
| 2standard | 384 | Tetu, Robert (1481) | Won 2-1 | +181542 |
| 3standard | 380 | Sheng, Jeff (1455) | Lost 1-2 | -201522 |
| 4standard | 400 | Resendez, Festus (1479) | Lost 0-2 | -191503 |
| 5standard | 417 | Robertson, Shawn (1462) | Lost 0-2 | -191484 |
| top | average opponent: 1475record: 1-4 | new rating: 1484 | ||
| Grand Prix Austin 2012 (ISD limited) | starting rating: 1529 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 144 | Russell, David M (1500) | Lost 1-2 | -191510 |
| 2sealed | 295 | Muawski, Chris (1482) | Won 2-0 | +181528 |
| 3sealed | 329 | Flores, Christopher (1483) | Won 2-1 | +171545 |
| 4sealed | 283 | Lewis, Elio (1548) | Won 2-1 | +181563 |
| 5sealed | 170 | Herrera, Procopio (1472) | Won 2-1 | +161579 |
| 6sealed | 212 | Villarreal, Hector (1506) | Lost 0-2 | -191560 |
| 7sealed | 180 | Thomas, David S (1621) | Lost 0-2 | -171543 |
| top | average opponent: 1516record: 4-3 | new rating: 1543 | ||
| Grand Prix Houston 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 55 | Gray, Corbett (1782) | Won 2-0 | +231523 |
| 5extended | 25 | Boccio, Matthew (1756) | Won 2-0 | +221545 |
| 6extended | 16 | Kibler, Brian (1908) | Won 2-0 | +251570 |
| 7extended | 11 | Morse, Jonathan D (1596) | Lost 0-1 | -181552 |
| 8extended | 30 | Yurchick, Adam (1932) | Lost 1-2 | -111541 |
| 9extended | 58 | Sung, Simon (1555) | Won 2-0 | +181559 |
| 10extended | 17 | Cruse, William (1551) | Lost 1-2 | -181541 |
| 11extended | 33 | Dumanski, Drew (1509) | Lost 0-2 | -191522 |
| 12extended | 33 | Zamora, Nathan (1598) | Won 2-1 | +201542 |
| 13extended | 25 | Suarez, Andres (1583) | Lost 0-2 | -181524 |
| 14extended | 35 | Scoges, Walker (1589) | Lost 1-2 | -171507 |
| 15extended | 34 | Steht, Lee (1695) | Won 2-1 | +221529 |
| top | average opponent: 1671record: 6-6 | new rating: 1529 | ||