On October 5, 2001 â On the last day of the season, 38 year-old Jamie Moyer (20-6) becomes the oldest first-time 20-game winner when the Mariners beat Texas at Safeco Field, 6-2. The Seattle southpaw will also compile a 21-7 record in 2003.
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Sources:
Baseball Reference October 5
National Pastime October 5
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game