At Minneapolis, the Yankees (6-20) edge the Twins, 3 – 2. Roger Maris, Mickey Mantle, and Joe Pepitone, with the game-winner in the 9th inning, hit homers for New York.

On May 9, 1966 — At Minneapolis, the Yankees (6-20) edge the Twins, 3 – 2. Roger Maris, Mickey Mantle, and Joe Pepitone, with the game-winner in the 9th inning, hit homers for New York.

Source:
Baseball Reference May 9