Using teammate Cliff Floyd’s bat, Mike Jacobs hits a three-run home run in his first major league at-bat, pinch-hitting in the 5th inning. The left-handed hitting backstop becomes the fourth Mets rookie to go deep in his big league debut, joining Benny Ayala, Mike Fitzgerald and Kazuo Matsui.

On August 21, 2005 — Using teammate Cliff Floyd’s bat, Mike Jacobs hits a three-run home run in his first major league at-bat, pinch-hitting in the 5th inning. The left-handed hitting backstop becomes the fourth Mets rookie to go deep in his big league debut, joining Benny Ayala, Mike Fitzgerald and Kazuo Matsui.


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Sources:
Baseball Reference August 21
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game