On May 10, 1936 — By beating the A’s, 7 – 2, at home the Yankees move into first place and will remain there the rest of the season. Rookie Joe DiMaggio makes his belated home debut and hits his first home run, off George Turbeville. Lou Gehrig has four hits and two RBIs and Johnny Murphy, in his first start of the season, picks up the win.

Source:
Baseball Reference May 10