On September 5, 1969 — Tom Seaver becomes the first pitcher in franchise history to win 20 games in one season when the Mets beat the Phillies at Shea Stadium, 5-1. ‘Tom Terrific’, who will finish the season with a 25-7 record for the world champs, tosses a five-hit, complete game to reach the milestone.

 


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Sources:
Baseball Reference September 5
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game