Major Events
Highest-Leverage International Windows: The senior tournament spine for roster tracking, rankings, and the biggest national-team swings.
World Baseball Classic
The top senior national-team event, with MLB participation and the strongest roster ceiling in the sport.
Global tournament - Every four yearsWBSC Premier 12
A WBSC senior tournament that rewards federation depth and professional-league availability outside the WBC window.
Global tournament - Every four years
Olympic Baseball
Olympic baseball has a high ranking weight when it appears, but qualification format and roster availability shape the field.
Olympic tournament - Host-program dependentRegional
Confederation And Multi-Sport Events: Regional tournament windows that help sort depth, age bands, and federation pipelines.
Asia Professional Baseball Championship
An East Asia-focused professional tournament that matters for depth tracking but carries a lighter senior ranking weight.
Regional tournament - Intermittent
Asian Games
A major Asia multi-sport window with rotating national-team roster rules and strong regional signal.
Regional tournament - Every four years
Pan American Games
The Americas multi-sport tournament lane for senior and development-stage national teams.
Regional tournament - Every four yearsFriendlies
Series Windows And Tune-Ups: Friendly series slots for roster testing, rivalry windows, and pre-tournament calibration.
Samurai Japan Series
Japan top-team tune-up windows, run around major international cycles and used for roster checks, send-off games, and national-team reps.
Friendly series - Usually March or November
K-Baseball Series
A KBO-backed Team Korea series launched in 2024 to strengthen the national-team program through branded international friendlies.
Friendly series - Irregular November windows