Grand slams by Red Sox teammates Vic Wertz and Rip Repulski at Fenway Park give Boston a 9 – 7 win over Chicago. The National League veteran Repulski’s 8th-inning shot off Don Ferrarese comes in his first American League at bat.

On May 10, 1960 — Grand slams by Red Sox teammates Vic Wertz and Rip Repulski at Fenway Park give Boston a 9 – 7 win over Chicago. The National League veteran Repulski’s 8th-inning shot off Don Ferrarese comes in his first American League at bat.

Source:
Baseball Reference May 10