1889 – The minor league season opens with the California League in San Francisco and Stockton. This year’s new rules include the first legal substitution rule and the reduction of balls for a walk from 5 to 4. The substitution rule, which allows a team to designate one man to be put into the game at the captain’s discretion at the end of any inning, will soon be modified.

On March 24, 1889 — 1889 – The minor league season opens with the California League in San Francisco and Stockton. This year’s new rules include the first legal substitution rule and the reduction of balls for a walk from 5 to 4. The substitution rule, which allows a team to designate one man to be put into the game at the captain’s discretion at the end of any inning, will soon be modified.

Sources –
Baseball Reference March 24
SABR Games Project
National Pastime March 24
Retro Sheet
Replay The Game

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