On June 23 2008 — 2008 – Felix Hernandez of the Seattle Mariners hits a 2nd-inning grand slam off Johan Santana of the New York Mets in a 5 – 2 victory. He is the first American League pitcher to hit a grand slam since Steve Dunning did so on May 11, 1971.

 


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Sources:

Baseball Reference June 23

SABR Games Project

National Pastime June 23

Hall of Fame

Replay The Game

Retro Sheet