At Denver, the Rockies blow a 6 – 0 lead in the 8th inning and lose to the Braves, 8 – 7, on Sid Bream’s pinch-hit, opposite field, pop fly grand slam.

On May 8, 1993 — At Denver, the Rockies blow a 6 – 0 lead in the 8th inning and lose to the Braves, 8 – 7, on Sid Bream’s pinch-hit, opposite field, pop fly grand slam.

Source:
Baseball Reference May 8