Nippon Professional Baseball

Baseball · Japan

Japan’s top baseball league — and still the gold-standard feeder into Major League Baseball.

Updated Jul 23, 2026

Founded: 1936 (as Japanese Baseball League; NPB era from 1950)
Headquarters: Tokyo

Key stats

12 clubs across Central and Pacific Leagues
Primary MLB pipeline: Ichiro, Ohtani, Yamamoto, Sasaki and dozens more
Posting system compensates NPB clubs when stars leave early
Full domestic season remains a year-round cultural calendar in Japan

Nippon Professional Baseball is Japan’s top circuit: two leagues, twelve clubs, and a season that sits at the center of Japanese sports culture from spring training through the Japan Series.

What sets NPB apart globally is export quality. MLB clubs treat successful NPB pitchers and hitters as proven, not speculative — which is why posting fees and free-agent contracts for Japanese stars keep resetting records.

The posting system pays NPB clubs when players leave before nine years of service; that bargain keeps talent flowing while compensating the teams that developed it.

NPB’s power is not IPL money. It is trust. As long as Yamamoto- and Ohtani-class players keep translating, NPB remains East Asia’s most valuable baseball product — and the league every other Asian baseball circuit is compared to.

On the Medalist Index

#2 · APAC League Power Rankings
The region’s deepest baseball product and still the gold-standard MLB feeder. Posting graduates from Ichiro through Ohtani, Yamamoto, and Sasaki keep pricing Japanese talent as proven, not speculative — and the 12-team domestic season remains a full-year cultural calendar.

Key stats

On the Medalist Index

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