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 ten real games — two a day for five days — and the time and tools to keep growing, every August at Koza Shinkin Stadium in Okinawa City.

8/17 – 8/21
2026 dates (completed)
Koza Shinkin
Stadium
Okinawa City
RESULTS

Tournament Results

View match results from the 2026 tournament.

Completed

The 2026 tournament has ended

Tournament dates
Aug 17, 2026 – Aug 21, 2026

Details of the next tournament will be announced once confirmed.

View results
INSTAGRAM

Instagram

Follow our latest updates.

View on Instagram →
JSL 2026 — Tournament completed
2026 overview: 10 games total (2 games × 5 days) · JSL 2025 · 37 players took the field

Details of the next tournament will be announced once confirmed.

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

2026 schedule (tournament archive)

01
Applications
June 1 (Mon) – July 31 (Fri), 2026
Apply online · document and video review
02
League period
August 17 (Mon) – 21 (Fri), 2026
10 games total (2 games × 5 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