On September 11, 1956 — Frank Robinson ties Wally Berger’s 1930 National League record for home runs by a rookie for home runs with his 38th in the Reds’ 11-5 victory over the Giants at Polo Grounds. A’s first baseman Mark McGwire will established the major league mark for freshman homers with 49 round-trippers in 1989.

Sources:
National Pastime

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