Oakland A’s first baseman Mark McGwire breaks Al Rosen’s American League rookie record, established in 1950, and ties the major league mark shared by Frank Robinson (1956) and Wally Berger (1930) when he hits his 38th homer of the season. The unanimous choice for Rookie of the Year will finish the season with 49 homers, smashing the existing major league record.

On August 11, 1987 — Oakland A’s first baseman Mark McGwire breaks Al Rosen’s American League rookie record, established in 1950, and ties the major league mark shared by Frank Robinson (1956) and Wally Berger (1930) when he hits his 38th homer of the season. The unanimous choice for Rookie of the Year will finish the season with 49 homers, smashing the existing major league record.

Source:
Baseball Reference August 11
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