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The Summer Regional Tournament are qualifying tournaments held in all 47 prefectures of Japan to determine the 49 teams that will compete at Summer Koshien each year. Teams are seeded base on how they perform in their Spring Regional Tournaments and Spring Prefectural Tournaments (i.e. Kanto Tournament).

In Tokyo's case, there are both West and East regionals. However, the Spring Tournament has teams from both regions face each other. If a team finishes in the Best 16 in the Tokyo Spring Tournament, they will automatically be a seeded team for their Summer Regional tournament.

Regionals for 87th Summer Koshien[]

West Tokyo Summer Regional
Teams Rank
Ichidaisan High Best 4 (at least)
Seidou High Best 8

Regionals for 88th Summer Koshien[]

West Tokyo Summer Regional
Teams Rank
Inashiro Industrial Champions
Seidou High Best 4


Regionals for 89th Summer Koshien[]

West Tokyo Summer Regional
Teams Rank
Inashiro Industrial Champions
Seidou High Runners-up
Sensen Academy Best 4
Sakurazawa High Best 4
Yakushi High Best 8
Akikawa Academy Fourth Round
Chigusa Metropolitan Fourth Round
Ichidaisan High Third Round
Tokamiyama High Third Round
Murata East High Third Round
Maimon West High Second Round
Seiko Academy First Round
East Tokyo Summer Regional
Teams Rank
Teito High Champions
Ugumori High Best 16
South Hokkaido Summer Regional
Teams Rank
Komaidai Fujimaki High Champions
Osaka Summer Regional
Teams Rank
Osaka Kiryu High Champions
Aichi Summer Regional
Teams Rank
Seihou High Champions
Miyagi Summer Regional
Teams Rank
Ikuei High Champions
Kagawa Summer Regional
Teams Rank
Ichizen High Champions

Regionals for 90th Summer Koshien[]

West Tokyo Summer Regional
Teams Rank
Seidou High
Inashiro Industrial
Ichidaisan High
Seiko Academy
Yakushi High
Sensen Academy
Norikane Academy Fifth Round
Hachiya Oji Fourth Round
Ichidai Institute Fourth Round
Itsumi UHS Fourth Round
Umegaya High Fourth Round
Yura Sogo Third Round
Toyonishiki Third Round
Tsuchigaku Afilliated High Third Round
Sawadai Second High Third Round
Rendai Academy Third Roound
Umeda Comprehensive High Second Round
Miyase First Second Round
Machikura Industrial Second Round
Chuo Sugiuchi Second Round
Niouji North First Round
Sakanoe High School First Round
East Tokyo Summer Regional
Teams Rank
Teito High Champions
Ugumori High Best 16
Seiko Academy First Round
Nanamori Academy -
Oya High -
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