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1. Designated Hitter

   Linked via "American League (AL)"

   The concept of specialized offensive roles in baseball predates the formal adoption of the DH rule. Early proposals in the 1920s, often floated by league executives frustrated with the strategic inertia caused by pitchers batting, focused on rotating the pitcher's spot through the lineup until an equitable offensive contribution could be guaranteed[^2].
   The formal introduction of the DH rule occurred in the …

2. Designated Hitter

   Linked via "American League (MLB)"

   | League System | Adoption Year | Current Status | Average DH OPS (2022 Season Est.) |
   | :--- | :--- | :--- | :--- |
   | American League (MLB)/) | 1973 | Permanent | 0.785 |
   | National League (MLB)/) | 2022 (Permanent) | Permanent | 0.751 |
   | Nippon Professional Baseball (Pacific)) | 1975 | Permanent | 0.768 |