JAPAN.LEAGUEINC.

JAPAN SUMMER LEAGUE

One more summer. One more shot to play the game on your terms.

August in Okinawa, Japan

Built for graduating high school players whose Koshien run came up short, JSL gives you five real games and the time and tools to keep growing — every August, at Koza Shinkin Stadium in Okinawa City.

How to ApplyCrowdfunding — coming soon
8/17-21
2026 dates
Koza Shinkin
Stadium
Okinawa City
SCHEDULE

Match Schedule

Check upcoming matches.

Coming Soon

The season hasn't started yet

Next event
Aug 17, 2026 – Aug 21, 2026
See full schedule
INSTAGRAM

Instagram

Follow our latest updates.

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JSL 2026 — Second Edition Confirmed.
JSL 2025 · 37 players took the field
About JSL

Where 18-year-olds show up —
and keep playing.

JSL was built for graduating high school players whose Koshien run ended early — and for anyone who wants to keep playing, meet new teammates, and figure out what comes next. The idea is simple: no one should be overlooked just because the bracket didn't go their way.

Every August, a new group of young players brings their own story to Okinawa and writes the next chapter on the field.

Features

Three things that make JSL different

One more summer to take baseball seriously. JSL backs your challenge across three pillars.

01Feature 01

Coaching from a top-level staff

The same coaches who lead the Japan Winter League are on the field with you — sharing what they know about the craft and the mindset behind it.

02Feature 02

Data on every play

Every pitch and at-bat is tracked, so you walk away with a clear picture of what's working and what to sharpen next.

03Feature 03

Level-Up Program

Skills, conditioning, self-analysis, and honest conversations about what comes after baseball — a chance to think about your next move.

Schedule

Schedule

01
Applications
June 1 (Mon) – August 14 (Fri), 2026
Apply online · document and video review
02
League period
August 17 (Mon) – 21 (Fri), 2026
Five games over five days · maximum of seven innings * Schedule and game count are subject to change due to team composition, weather, etc.
CONTACT
Get in touch

Build the next chapter
with us.

Partnerships, sponsorship, player applications, press — whatever brings you here,
we'd be glad to talk.

CONTACT US