In the first game of a doubleheader, Cubs reliever Elmer Singleton defeats reliever Lindy McDaniel of the Cardinals, 10 – 9. In the nightcap, McDaniel is the winner and Singleton the loser, 8 – 7.

On May 10, 1959 — In the first game of a doubleheader, Cubs reliever Elmer Singleton defeats reliever Lindy McDaniel of the Cardinals, 10 – 9. In the nightcap, McDaniel is the winner and Singleton the loser, 8 – 7.

Source:
Baseball Reference May 10