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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
Murata East High Third Round
Maimon West High Second Round
East Tokyo Summer Regional
Teams Rank
Teito High Champions
Ugumori High Best 16
Seiko Academy First Round
South Hokkaido Summer Regional
Teams Rank
Komaidai Fujimaki High Champions
Osaka Summer Regional
Teams Rank
Osaka Kiryu High Champions
Miyagi Summer Regional
Teams Rank
Ikuei High Champions
Kagawa Summer Regional
Teams Rank
Ichizen High Champions
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