At Memorial Stadium, Mickey Mantle slices an opposite field homer in the 8th inning off Dick Hall to give New York a 3 – 2 win over the Orioles.

On May 15, 1965 — At Memorial Stadium, Mickey Mantle slices an opposite field homer in the 8th inning off Dick Hall to give New York a 3 – 2 win over the Orioles.

Source:
Baseball Reference May 15