On August 15, 1951 — Al Rosen belts a 1st-inning grand slam to jump start the Indians to a 9 – 4 win over the Browns, their 13th in a row. For Rosen, it is his fourth slam of the year, just the 9th player to accomplish the feat. Ned Garver gives up seven runs in the 1st inning in losing to Early Wynn.

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Source:
Baseball Reference August 15
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
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