1984 – Rookie Mark Langston (15-9) becomes the first Mariner to win 15 games in a season by beating the Royals, 2 – 1, on a 5-hitter.

This Day In Baseball

On September 14, 1984 — 1984 – Rookie Mark Langston (15-9) becomes the first Mariner to win 15 games in a season by beating the Royals, 2 – 1, on a 5-hitter.

 

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Sources:
Baseball Reference September 14
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game