The Athletics defeat the Twins by a score of 15 – 5. Oakland CF Ernie Young gets four safeties, including three home runs, and drives home 6. Young entered the game with three career homers in 164 major league at-bats. He is believed to have had the fewest career home runs of any player ever to hit three in a game.

On May 10, 1996 — The Athletics defeat the Twins by a score of 15 – 5. Oakland CF Ernie Young gets four safeties, including three home runs, and drives home 6. Young entered the game with three career homers in 164 major league at-bats. He is believed to have had the fewest career home runs of any player ever to hit three in a game.

Source:
Baseball Reference May 10