On September 10, 2007 — 2007 – Troy Tulowitzki homers off of Kyle Lohse. It is his 20th home run of the season and gives him the record for National League rookie shortstops. Ernie Banks had held the record with 19 for 53 years.

 


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Sources:
Baseball Reference September 10
National Pastime September 10
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game