Ishizaka, Akira
Current rating: 1649
Record: 52-44 (GP) / 3-5 (professional)
Grand Prix Yokohama 2010Grand Prix Kobe 2014Grand Prix Kyoto 2015Grand Prix Chiba 2015Grand Prix Kobe 2015Grand Prix Nagoya 2016Grand Prix Shizuoka 2017Grand Prix Kobe 2017Grand Prix Kyoto 2017Grand Prix Chiba 2018Grand Prix Yokohama 2019Mythic Championship IVGrand Prix Barcelona 2019Grand Prix Chiba 2019
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1649 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 353 | Klenske, Dylan (1244) | Lost 0-2 | -251624 |
| 3sealed | 659 | Kazama, Yusaku (1606) | Lost 1-2 | -191605 |
| 4sealed | 814 | Takahama, Ryusuke (1485) | Won 2-0 | +161621 |
| 5sealed | 848 | Mukai, Kuniteru (1367) | Won 2-1 | +141635 |
| 6sealed | 451 | Maeda, Hinata (1571) | Lost 1-2 | -201615 |
| 7sealed | 600 | Sakai, Daichi (1551) | Won 2-0 | +171632 |
| 8sealed | 417 | Shibata, Takeshi (1581) | Won 2-1 | +171649 |
| top | average opponent: 1486record: 4-3 | new rating: 1649 | ||
| Grand Prix Barcelona 2019 (modern) | starting rating: 1708 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 137 | Rodriguez Pozo, Jose Antonio (1666) | Lost 1-2 | -191689 |
| 3modern | 488 | Perez, Oscar (1517) | Lost 1-2 | -211668 |
| 4modern | 668 | Vailati, Massimo (1605) | Lost 1-2 | -191649 |
| top | average opponent: 1596record: 0-3 | new rating: 1649 | ||
| Mythic Championship IV (modern) | starting rating: 1753 | |||
| round | table | opponent (rating) | result | Δrating |
| 1draft | 101 | Lima Cardoso, Filipe (1751) | Lost 0-2 | -181735 |
| 2draft | 136 | Crusius, Matheus (1823) | Lost 1-2 | -171718 |
| 3draft | 143 | Papadopoulos, Panagiotis (2005) | Lost 0-2 | -121706 |
| 4modern | 225 | Bhayana, Milan (1418) | Lost 0-2 | -241682 |
| 5modern | 226 | Kenkel, Patrick (1519) | Won 2-1 | +151697 |
| 6modern | 205 | Ingram, Nickolas (1534) | Lost 1-2 | -201677 |
| 7modern | 206 | Gerard, Brian (1561) | Won 2-0 | +151692 |
| 8modern | 178 | Peng, Zer Shiuan (1539) | Won 2-1 | +161708 |
| top | average opponent: 1644record: 3-5 | new rating: 1708 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1553 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 591 | Takeshita, Shuhei (1437) | Won 2-0 | +151568 |
| 2modern | 582 | Shibata, Takeshi (1563) | Won 2-0 | +181586 |
| 3modern | 167 | Peng, Jianjia (1785) | Won 2-0 | +221608 |
| 4modern | 112 | Koh, Kai Che (1628) | Won 2-0 | +181626 |
| 5modern | 116 | Fukushima, Yuuhei (1592) | Won 2-1 | +181644 |
| 6modern | 1 | Boku, Takashi (1735) | Won 2-1 | +191663 |
| 7modern | 24 | Kawaguchi, Takashi (1687) | Lost 1-2 | -171646 |
| 8modern | 60 | Tokairin, Taishi (1531) | Won 2-1 | +161662 |
| 9modern | 47 | Ikeda, Hiroaki (1638) | Lost 1-2 | -191643 |
| 10modern | 75 | Nakano, Akinori (1674) | Won 2-0 | +191662 |
| 11modern | 91 | Kawasoe, Shintaro (1683) | Won 2-0 | +181680 |
| 12modern | 45 | Hata, Hideaki (1744) | Won 2-1 | +191699 |
| 13modern | 19 | Soejima, Yuichi (1684) | Won 2-0 | +181717 |
| 14modern | 16 | Hashimoto, Arata (1641) | Won 2-1 | +171734 |
| 15modern | 11 | Fujita, Osamu (1799) | Won 2-1 | +191753 |
| top | average opponent: 1655record: 13-2 | new rating: 1753 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1515 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 286 | Ito, Kenta (1471) | Won 2-1 | +171532 |
| 2sealed | 186 | Chiba, Tatsuya (1364) | Lost 1-2 | -211511 |
| 3sealed | 948 | Saijo, Hayato (1507) | Lost 1-2 | -181493 |
| 4sealed | 1028 | Ito, Keita (1480) | Won 2-0 | +181511 |
| 5sealed | 773 | Hatanaka, Natsuki (1501) | Won 2-0 | +181529 |
| 6sealed | 661 | Kobayashi, Atsumu (1534) | Won 2-0 | +181547 |
| 7sealed | 206 | Kurata, Shintaro (1788) | Lost 0-2 | -141533 |
| 8sealed | 399 | Ueda, Ryo (1601) | Won 2-0 | +201553 |
| top | average opponent: 1531record: 5-3 | new rating: 1553 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 142 | Hirana, Ryo (1500) | Lost 0-2 | -181480 |
| 2sealed | 859 | Lau, Zac (1482) | Won 2-1 | +181498 |
| 3sealed | 905 | Fujiyoshi, Manabu (1544) | Lost 1-2 | -171481 |
| 4sealed | 945 | Fujiwara, Koichi (1472) | Lost 1-2 | -181463 |
| 5sealed | 1032 | Burgos, Mark Joseph (1461) | Won 2-1 | +181481 |
| 6sealed | 806 | Takahashi, Katsuhisa (1478) | Won 2-0 | +181499 |
| 7sealed | 705 | Akase, Kousuke (1493) | Won 2-1 | +181517 |
| 8sealed | 573 | Nishikawa, Haruyoshi (1603) | Won 2-1 | +191536 |
| 9sealed | 279 | Uchiyama, Kouichi (1358) | Lost 0-2 | -211515 |
| top | average opponent: 1488record: 5-4 | new rating: 1515 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1490 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 289 | Yoshimura, Syouichi (1496) | Won 2-0 | +181508 |
| 3modern | 178 | Takagi, Takeshi (1650) | Lost 0-2 | -161492 |
| 4modern | 664 | Joe, Hu (1520) | Lost 0-2 | -171475 |
| 5modern | 751 | Shin, Takahiro (1504) | Won 2-1 | +181493 |
| 6modern | 584 | Tsutazawa, Hiroshi (1585) | Lost 1-2 | -161477 |
| 7modern | 687 | Hasegawa, Suguru (1625) | Lost 1-2 | -151462 |
| 8modern | 897 | Nakahara, Hiroki (1479) | Won 2-1 | +181480 |
| 9modern | 740 | Hashimoto, Hiromune (1504) | Won 2-1 | +181498 |
| top | average opponent: 1545record: 4-4 | new rating: 1498 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1515 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 428 | Osawa, Takuya (2033) | Lost 1-2 | -91506 |
| 3standard | 945 | Hirase, Gun (1475) | Lost 1-2 | -191487 |
| 4standard | 1160 | Imaoka, Syoichi (1611) | Won 2-0 | +201507 |
| 5standard | 847 | Kanbayashi, Hirotaka (1485) | Won 2-0 | +181525 |
| 6standard | 719 | Ura, Hikaru (1519) | Won 2-0 | +181543 |
| 7standard | 402 | Takahashi, Toshirou (1498) | Lost 0-2 | -191524 |
| 8standard | 473 | Katou, Syouya (1485) | Lost 0-2 | -191505 |
| 9standard | 709 | Sano, Futoshi (1634) | Lost 0-2 | -151490 |
| top | average opponent: 1592record: 3-5 | new rating: 1490 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1388 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 779 | Ishikawa, Kento (1500) | Won 2-0 | +201408 |
| 2sealed | 98 | Yanagawa, Hideyuki (1437) | Lost 1-2 | -171391 |
| 3sealed | 842 | Yahagi, Shuhei (1510) | Won 2-0 | +201411 |
| 4sealed | 543 | Kondou, Keiichi (1538) | Won 2-1 | +201431 |
| 5sealed | 290 | Yoshimori, Sho (1804) | Won 2-0 | +251456 |
| 6sealed | 187 | Kim, Cynic (1851) | Won 2-0 | +251481 |
| 7sealed | 155 | Kadono, Kohei (1557) | Won 2-1 | +191500 |
| 8sealed | 108 | Nakai, Sunao (1714) | Lost 1-2 | -141486 |
| 9sealed | 142 | Urano, Syouhei (1527) | Won 2-0 | +191505 |
| 10draft | 231 | Ikenoko, Hidehiro (1564) | Lost 1-2 | -171488 |
| 11draft | 122 | Kobayashi, Keita (1557) | Lost 0-2 | -171471 |
| 12draft | 196 | Mori, Shotaro (1623) | Won 2-0 | +211492 |
| 13draft | 355 | Itakura, Toshiyuki (1664) | Lost 1-2 | -151477 |
| 14draft | 174 | Suga, Hiroki (1581) | Won 2-0 | +201497 |
| 15draft | 182 | Nakai, Tomoki (1505) | Won 2-0 | +181515 |
| top | average opponent: 1595record: 10-5 | new rating: 1515 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 759 | Nakamura, Masanobu (1379) | Lost 1-2 | -191414 |
| 2standard | 683 | Shiba, Naoto (1680) | Lost 0-2 | -131401 |
| 3standard | 1086 | Maruyama, Hiromu (1466) | Lost 0-2 | -171384 |
| 4standard | 1174 | Kakiki, Ayumu (1361) | Won 2-1 | +181402 |
| 5standard | 1052 | Higashimori, Kazunori (1469) | Lost 0-2 | -171385 |
| 6standard | 949 | Gibralta, Thierry (1447) | Lost 1-2 | -171368 |
| 7standard | 807 | Mitui, Kenichiro (1423) | Won 2-0 | +191387 |
| 8standard | 679 | Yamasita, Akinori (1398) | Lost 1-2 | -181369 |
| 9standard | 575 | Fukuhara, Mitsutaka (1425) | Won 2-0 | +191388 |
| top | average opponent: 1450record: 3-6 | new rating: 1388 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1148 | Osuga, Hiroaki (1396) | Lost 0-2 | -191433 |
| top | record: 0-1 | new rating: 1433 | ||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1474 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 317 | Yatsu, Tomoki (1467) | Lost 1-2 | -191455 |
| 2legacy | 261 | Matsuda, Yukihisa (1322) | Won 2-1 | +161471 |
| 3legacy | 389 | Hirano, Aimi (1504) | Lost 0-2 | -171454 |
| 4legacy | 398 | Mori, Tomotaka (1465) | Won 2-0 | +181472 |
| 5legacy | 329 | Kubo, Yuta (1380) | Lost 1-2 | -201452 |
| top | average opponent: 1428record: 2-3 | new rating: 1452 | ||
| Grand Prix Kobe 2014 (modern) | starting rating: 1492 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 908 | Shimodouzono, Shintaro (1456) | Lost 0-2 | -181474 |
| top | record: 0-1 | new rating: 1474 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 327 | Sakuma, Toshimitsu (1695) | Won 2-1 | +221522 |
| 2extended | 220 | Sekikawa, Tsubasa (1518) | Won 2-0 | +171539 |
| 3extended | 111 | Murata, Daisuke (1691) | Lost 0-2 | -151524 |
| 4extended | 209 | Takahashi, Tomoki (1517) | Lost 0-2 | -181506 |
| 5extended | 363 | Hioki, Takuro (1499) | Won 2-0 | +181524 |
| 6extended | 254 | Nonaka, Kentarou (1700) | Lost 0-2 | -151509 |
| 7extended | 231 | Kimura, Shigeki (1569) | Lost 1-2 | -171492 |
| top | average opponent: 1599record: 3-4 | new rating: 1492 | ||