Seko, Kazuki
Current rating: 1428
Record: 57-66-2
Grand Prix Yokohama 2013Grand Prix Kitakyushu 2013Grand Prix Shizuoka 2013Grand Prix Nagoya 2014Grand Prix Kobe 2014Grand Prix Shizuoka 2015Grand Prix Chiba 2015Grand Prix Kobe 2015Grand Prix Nagoya 2016Grand Prix Tokyo 2016Grand Prix Chiba 2016Grand Prix Shizuoka 2017Grand Prix Kobe 2017Grand Prix Kyoto 2017Grand Prix Chiba 2018
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1444 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 169 | Sato, Yuki (1527) | Lost 0-2 | -161428 |
| top | record: 0-1 | new rating: 1428 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1418 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 115 | Taniwaki, Hikaru (1500) | Won 2-0 | +191437 |
| 2sealed | 136 | Nishimura, Takashi (1469) | Lost 1-2 | -171420 |
| 3sealed | 648 | Teo, Justin (1474) | Won 2-0 | +191439 |
| 4sealed | 755 | Sugimoto, Takashi (1509) | Lost 1-2 | -171422 |
| 5sealed | 788 | Wouters, Robin (1526) | Won 2-0 | +201442 |
| 6sealed | 524 | Katagiri, Keisuke (1533) | Lost 1-2 | -161426 |
| 7sealed | 716 | Kakiuchi, Nobuyuki (1535) | Lost 1-2 | -161410 |
| 8sealed | 718 | Morizane, Hitoshi (1344) | Won 2-0 | +171427 |
| 9sealed | 533 | Ohmoto, Masaya (1417) | Won 2-1 | +171444 |
| top | average opponent: 1479record: 5-4 | new rating: 1444 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1419 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 472 | Matsuyama, Tsubasa (1500) | Lost 1-2 | -171402 |
| 2modern | 860 | Sato, Ryoji (1465) | Won 2-1 | +201422 |
| 3modern | 945 | Shinagawa, Kazunari (1493) | Won 2-1 | +191441 |
| 4modern | 475 | Yamada, Hiroki (1633) | Won 2-1 | +211462 |
| 5modern | 599 | Iwatsu, Hirotaka (1641) | Lost 0-2 | -141448 |
| 6modern | 429 | Kurata, Kazuyoshi (1536) | Won 2-1 | +191467 |
| 7modern | 1119 | Ishimaru, Ken (1715) | Lost 1-2 | -131454 |
| 8modern | 519 | Lin, Cheng How (1490) | Lost 0-2 | -181436 |
| 9modern | 733 | Muneishi, Hideaki (1418) | Lost 1-2 | -181418 |
| top | average opponent: 1544record: 4-5 | new rating: 1418 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1376 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 178 | Hiromasa, Ryuusuke (1662) | Won 2-0 | +231399 |
| 2standard | 391 | Ueda, Kazuki (1597) | Lost 1-2 | -141385 |
| 3standard | 1019 | Sawada, Ryo (1393) | Lost 1-2 | -181367 |
| 4standard | 1143 | Fujita, Osamu (1660) | Won 2-0 | +231390 |
| 5standard | 714 | Mizoguchi, Satoru (1462) | Won 2-0 | +191409 |
| 6standard | 624 | Fujiyoshi, Manabu (1533) | Lost 1-2 | -151394 |
| 7standard | 835 | Ho, Ming Ho (1536) | Lost 0-2 | -161378 |
| 8standard | 861 | Arita, Kazuhiro (1419) | Won 2-1 | +191397 |
| 9standard | 684 | Inoue, Yuusuke (1617) | Won 2-1 | +221419 |
| top | average opponent: 1542record: 5-4 | new rating: 1419 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1453 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 464 | Mochiki, Kazuto (1750) | Lost 0-2 | -121441 |
| 2legacy | 712 | Maezono, Kenta (1699) | Lost 1-2 | -141427 |
| 3legacy | 1061 | Kunii, Taiki (1466) | Won 2-1 | +191446 |
| 4legacy | 1067 | Hatada, Junya (1499) | Lost 0-2 | -171429 |
| 5legacy | 1013 | Ushijima, Syun (1400) | Lost 1-2 | -191410 |
| 6legacy | 1023 | Nakamura, Koudai (1459) | Won 2-0 | +191429 |
| 7legacy | 912 | Yanai, Ryosaku (1381) | Lost 1-2 | -191410 |
| 8legacy | 871 | Yamada, Takashi (1531) | Lost 0-2 | -151395 |
| 9legacy | 768 | Aoi, Masashi (1370) | Lost 0-2 | -191376 |
| top | average opponent: 1506record: 2-7 | new rating: 1376 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1459 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 750 | Konno, Tomoyuki (1464) | Lost 1-2 | -181441 |
| 2standard | 913 | Odaka, Masatoshi (1483) | Lost 0-2 | -171424 |
| 3standard | 1569 | Nagasawa, Toru (1462) | Won 2-0 | +181442 |
| 4standard | 1386 | Fukumoto, Nobuhiro (1431) | Won 2-1 | +181460 |
| 5standard | 924 | Fukasawa, Shinya (1559) | Lost 1-2 | -161444 |
| 6standard | 1293 | Kojima, Seigo (1481) | Won 2-0 | +191463 |
| 7standard | 1079 | Nishiyama, Shinosuke (1485) | Won 2-0 | +181481 |
| 8standard | 549 | Naono, Shuichi (1423) | Won 2-1 | +171498 |
| 9standard | 513 | Cho, Sejeong (1506) | Won 2-1 | +181516 |
| 10standard | 288 | Yusuke, Ono (1561) | Lost 1-2 | -171499 |
| 11standard | 377 | Hasebe, Shunichi (1465) | Lost 0-2 | -191480 |
| 12standard | 394 | Tadano, Syunta (1490) | Won 2-1 | +181498 |
| 13standard | 342 | Moriya, Daisuke (1759) | Lost 1-2 | -131485 |
| 14standard | 311 | Sasaki, Tsuyoshi (1482) | Lost 1-2 | -181467 |
| 15standard | 283 | Ishimaru, Ken (1712) | Lost 1-2 | -141453 |
| top | average opponent: 1518record: 7-8 | new rating: 1453 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 633 | Mukuno, Yuuji (1724) | Lost 1-2 | -131435 |
| 2sealed | 912 | Watanabe, Takefumi (1547) | Lost 0-2 | -161419 |
| 3sealed | 1269 | Yamaoka, Keita (1484) | Draw 1-1 | +11420 |
| 4sealed | 1168 | Nagae, Kazuya (1455) | Won 2-0 | +191439 |
| 5sealed | 1006 | Marcy, Brian (1482) | Lost 0-2 | -181421 |
| 6sealed | 1033 | Novitovic, Dejan (1461) | Lost 1-2 | -171404 |
| 7sealed | 940 | Cole, Lewis (1394) | Won 2-0 | +181422 |
| 8sealed | 793 | Kounosu, Hiroaki (1358) | Won 2-1 | +171439 |
| 9sealed | 657 | Li, Ang 4241 (1544) | Won 2-1 | +201459 |
| top | average opponent: 1494record: 4-4-1 | new rating: 1459 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 718 | Oku, Kousuke (1385) | Lost 0-2 | -201450 |
| 2standard | 685 | Nakashima, Takuya (1482) | Won 2-0 | +191469 |
| 3standard | 873 | Yashiki, Syunta (1497) | Won 2-0 | +181487 |
| 4standard | 690 | Yamashita, Kohji (1159) | Lost 1-2 | -231464 |
| 5standard | 637 | Tokuyama, Yoshihiko (1488) | Won 2-1 | +181482 |
| 6standard | 563 | Mokudari, Masahiro (1521) | Lost 0-2 | -171465 |
| 7standard | 595 | Chan, Tin Yan (1461) | Won 2-1 | +181483 |
| 8standard | 502 | Miyawaki, Yusuke (1492) | Lost 0-2 | -181465 |
| 9standard | 432 | Matsuyama, Takuya (1517) | Lost 1-2 | -171448 |
| top | average opponent: 1445record: 4-5 | new rating: 1448 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 25 | Oonishi, Takahisa (1604) | Lost 1-2 | -161467 |
| 4sealed | 231 | Bachura, Miroslav (1548) | Lost 0-2 | -161451 |
| 5sealed | 413 | Thompson, Liam (1495) | Won 2-0 | +181469 |
| 6sealed | 288 | Tsutai, Koutarou (1322) | Won 2-0 | +161485 |
| 7sealed | 182 | Mizuno, Fumihiro (1486) | Lost 0-2 | -181467 |
| 8sealed | 197 | Tanigawa, Futa (1538) | Won 2-1 | +191486 |
| 9sealed | 137 | Lu, Bo (1584) | Lost 1-2 | -161470 |
| top | average opponent: 1511record: 3-4 | new rating: 1470 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1558 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 614 | Takaoka, Yusuke (1571) | Lost 1-2 | -171541 |
| 4sealed | 743 | Tomomizu, Takuya (1437) | Draw 1-1 | -21539 |
| 5sealed | 824 | Dong, Hyouk Kim (1512) | Won 2-0 | +171556 |
| 6sealed | 743 | Hori, Daisuke (1771) | Lost 1-2 | -141542 |
| 7sealed | 826 | Gutsche, Lennart (1473) | Lost 0-2 | -191523 |
| 8sealed | 811 | Fujii, Ami (1357) | Lost 0-2 | -211502 |
| 9sealed | 790 | Mori, Yuta (1450) | Lost 1-2 | -191483 |
| top | average opponent: 1510record: 1-5-1 | new rating: 1483 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1559 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 285 | Muraoka, Hideaki (1546) | Won 2-0 | +181577 |
| 3modern | 195 | Masatsugu, Tatsuya (1536) | Won 2-1 | +171594 |
| 4modern | 52 | Fukui, Shunsuke (1550) | Won 2-1 | +171611 |
| 5modern | 71 | Matsuda, Issui (1720) | Lost 0-2 | -161595 |
| 6modern | 155 | Tomikawa, Akihisa (1613) | Lost 0-2 | -171578 |
| 7modern | 239 | Mishio, Takenori (1473) | Lost 1-2 | -201558 |
| 8modern | 244 | Yoshimura, Wataru (1486) | Won 2-1 | +171575 |
| 9modern | 169 | Ishimaru, Ken (1679) | Lost 1-2 | -171558 |
| top | average opponent: 1576record: 4-4 | new rating: 1558 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 639 | Hashimoto, Akio (1522) | Lost 1-2 | -181500 |
| 3sealed | 789 | Ishihara, Jun (1630) | Lost 0-2 | -151485 |
| 4sealed | 818 | Kato, Yuji (1483) | Won 2-0 | +181503 |
| 5sealed | 740 | Fukutani, Yuto (1501) | Lost 1-2 | -181485 |
| 6sealed | 763 | Arita, Ryuichi (1658) | Won 2-0 | +211506 |
| 7sealed | 723 | Fukaya, Yuta (1519) | Won 2-1 | +181524 |
| 8sealed | 653 | Takahashi, Osamu (1505) | Won 2-1 | +181542 |
| 9sealed | 602 | Sasaki, Yusuke 6248 (1513) | Won 2-0 | +171559 |
| top | average opponent: 1541record: 5-3 | new rating: 1559 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 122 | Tozuka, Kouta (1574) | Lost 0-2 | -171500 |
| 3standard | 238 | Yuasa, Kentarou (1632) | Won 2-1 | +201520 |
| 4standard | 236 | Mamiya, Takumi (1471) | Lost 1-2 | -191501 |
| 5standard | 309 | Nishi, Yohei (1444) | Won 2-0 | +171518 |
| 6standard | 139 | Hattori, Taiki (1671) | Lost 1-2 | -151503 |
| 7standard | 247 | Matsumoto, 0127 (1484) | Lost 1-2 | -181485 |
| 8standard | 199 | Naito, Yuuki (1364) | Won 2-0 | +161501 |
| 9standard | 322 | Tanahashi, Hirofumi (1489) | Won 2-0 | +171518 |
| top | average opponent: 1516record: 4-4 | new rating: 1518 | ||
| Grand Prix Kitakyushu 2013 (M14 standard) | starting rating: 1555 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 25 | Yamagami, Yudai (1647) | Won 2-0 | +201575 |
| 3standard | 30 | Sato, Hisao (1556) | Lost 1-2 | -181557 |
| 4standard | 361 | Hayashi, Shouya (1640) | Lost 0-2 | -171540 |
| 5standard | 377 | Aoki, Shougo (1477) | Lost 1-2 | -191521 |
| 6standard | 442 | Oku, Daisaku (1488) | Lost 0-2 | -191502 |
| 7standard | 380 | Yoshida, Shohei (1467) | Won 2-1 | +181520 |
| 8standard | 294 | Mizutani, Yoshinobu (1473) | Won 2-0 | +171537 |
| 9standard | 243 | Takahashi, Osamu (1421) | Lost 0-2 | -201517 |
| top | average opponent: 1521record: 3-5 | new rating: 1517 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 769 | Sasaki, Yuusuke (1740) | Lost 0-2 | -141486 |
| 2sealed | 950 | Furuya, Masashi (1503) | Won 2-1 | +191505 |
| 3sealed | 1070 | Nagayama, Sou (1501) | Lost 0-2 | -181487 |
| 4sealed | 1011 | Meguro, Kaito (1482) | Won 2-0 | +171504 |
| 5sealed | 1009 | Yoda, Yuuji (1464) | Lost 0-2 | -181486 |
| 6sealed | 969 | Kawakami, Masashi (1340) | Won 2-0 | +151501 |
| 7sealed | 904 | Satou, Naoki (1533) | Won 2-1 | +191520 |
| 8sealed | 982 | Tsuba, Yuuki (1644) | Won 2-1 | +201540 |
| 9sealed | 945 | Naito, Yuuki (1401) | Won 2-0 | +151555 |
| top | average opponent: 1512record: 6-3 | new rating: 1555 | ||