Answered April 16th, 2019

Lou Gehrig becomes the first player to hit four home runs in a game in the twentieth century as the Yankees set an MLB record with 50 total bases in a 20-13 win over Philadelphia.

Who was the first player with 4 HR in a game after 1900?
Interpreted as:
Who was the first player with 4 or more HR in a game after 1900?