On September 30, 2009 â Francisco Rodriguez becomes the fourth pitcher in the history of the game to yield two walk-off grand slams in the same season when Justin Maxwell goes deep, giving Washington a dramatic 7-4 victory over the Mets at Nationals Park. Last month, Everth Cabrera of the Padres also hit a game-ending four-run round-tripper, making K-Rod Rodriguez the only major leaguer to surrender two game-winning grand slams to a pair of rookies.
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Sources:
Baseball Reference September 30
National Pastime September 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game