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BaseballYouthAug 6 – 10, 2027Researched by us

Kanto Diamond Invitational

Yokohama Municipal Baseball Park — Yokohama, Kanagawa (JP)

GameVoyaGradeA80/100
Know Before You Pay

Ours, from the published record

Attendee Rating

4.3/5

3 reviews · 100% would return

Theirs, from the teams who went

Organizer page

GameVoyaGrade

Know Before You Pay

A · Strong on paper80/100

Good value and terms that favour the team, with at most one soft spot in the published detail.

Grade components

Value for money36.3 / 41
Terms and transparency32.5 / 37
Exposure for players11 / 22
How this is calculated

How much of this is published

Fully published4 of 4

This organizer publishes all four terms facts, so the grade rests entirely on stated figures.

The four gradeable facts are the entry fee, the refund policy, the hotel requirement and the guaranteed game count. Anything the organizer leaves out is priced at the middle of its range rather than counted against them — most operators quote on application, and a grade that punished silence would be reporting our own missing data as their failing.

  • Tiered refunds+8.5
  • No hotel block required+9
  • 6 games guaranteed+7.5
  • Organizer verified by us+7.5
  • Exposure not published+11

Attendee Rating

Positive4.3/5

Reliably good. Reviewers would return, with one or two caveats worth reading.

What attendees rated

Organization5.0
Officiating3.7
Value4.0
Venue5.0

100% of reviewers would bring a team back

Attendee Rating

4.3/5

3 reviews · 100% would return

Coaches, managers, parents, players, officials and scouts who attended. Never the organizer.

Reviewers here averaged 4.6 out of 5. The published figure is 4.3 because a rating from a handful of reviews is pulled toward the directory average until there are enough of them to stand on their own — which is what stops one glowing review putting an event at the top of the table.

Coaches, managers, parents, players, officials and scouts who attended. Never the organizer.

Organizers may answer a review in public, and their responses are labelled and shown. They are excluded from every average, count and return rate here, so an operator cannot move their own rating.

What to expect

Fifty years old, with a separate bracket for foreign entrants since 2011 and an interpreter assigned to every visiting team. Entry is quoted in US dollars for overseas teams. Six games in five days is a heavy schedule in August humidity, and the travel cost dwarfs the entry fee for anyone outside the region.

What it costs

Team entry fee$1,420USD · $1,420 USD equivalent
Games guaranteed6Round robin (4) + championship bracket
Cost per guaranteed game$237 USD29% below the median for youth baseball
Hotel blockNot publishedOptional — teams may book their own accommodation.
Refund policyTiered refundsFull refund to 60 days out, 50% to 30 days, none inside 30 days.
Registration deadlineJun 25, 2027Closes Jun 25, 2027

What a player gets seen doing

Not published

11 / 22 exposure points

The organizer publishes nothing about scouts, streaming, video or stats. That is normal for a house or in-season tournament and is not held against the event.

Not stated by the organizer

  • Scouts and college coaches attend
  • Showcase format
  • Advances to a championship
  • Games streamed
  • Game video for teams
  • Live stats and standings
  • Professional photography

Silence is scored as an unknown, not as a no. Nothing here is deducted for a feature the organizer simply did not mention.

Format and divisions

Age brackets
12U15U
Competitive tiers
International
Field size
24 teams
Diamonds in play
4
Included
  • Volunteer umpire crews
  • interpreter assigned per visiting team
  • groundskeeping between games
  • no gate fee

3 reviews from teams that went

Attendee Rating 4.3 / 5

  1. Fifty years of practice shows

    Michiko Arisawa · Team manager · Kawasaki Little Giants 12U · attended 2026

    5/5

    The schedule is published in April and does not move. Groundskeeping between games is done properly by volunteers who have been doing it for decades. Umpiring is volunteer and occasionally inconsistent on the strike zone, which is the only real criticism.

    Organization
    5
    Officiating
    4
    Value
    4
    Venue
    5
    Would return

  2. The interpreter changed the trip

    Gordon Feathersby · Coach · Auckland Kings 15U · attended 2026

    5/5

    Every visiting team gets an interpreter for the weekend and ours stayed with us from arrival to the final. We understood the rules meetings, the schedule and the umpires' calls. Entry was 1420 US for six games. The flights cost four times that, so budget the trip rather than the entry.

    Organization
    5
    Officiating
    4
    Value
    4
    Venue
    5
    Would return

  3. Six games in five days is a lot in August

    Sung-min Baek · Coach · Incheon Landers Youth 12U · attended 2025

    4/5

    Superbly organised and the park is immaculate. The humidity plus six games meant we were managing arms from the second day and two of our players cramped badly. Worth knowing before you enter a small roster.

    Organization
    5
    Officiating
    3
    Value
    4
    Venue
    5
    Would return

Review this tournament

You attended Kanto Diamond Invitational. Tell the next team what to expect.

This is the Attendee Rating — the half of a listing we cannot work out ourselves. It is filed by people who were at the event: coaches, managers, parents, players, officials and scouts. Organizers cannot file one, and the GameVoyaGrade never reads reviews at all.

Overall *

Your verdict on the weekend as a whole.

Organization *

Schedule accuracy, communication, on-site staffing.

Officiating *

Standard and consistency of the crews.

Value *

What you got for the entry fee and travel cost.

Venue *

Facility, playing surface, spectator space.

Moderated before publication. We never publish your email, and this form does not ask for one. info@gamevoya.com is where a question about a review goes.