On May 20, 1984, Darrell Porter launched a walk off two run bomb in the bottom of the ninth at Busch, that led the Cardinals to 3-2 victory over the visiting Cincinnati Reds. Porter also drove in the first Redbird run of the contest with a game tying single in the seventh, before watching Cincy's Dan Driessen come up with a pinch hit RBI in the eighth that put the Birds down 2-1. After failing to plate a run in the bottom of the eighth the Cardinals had one more shot at victory, and it was an opportunity that would not be wasted. Ken Oberkfell led off the frame with a double, which set up the ninth inning heroics by Porter. The Cardinals backstop came to the plate simply hoping to put the ball over an outfielders head. He definitely did that, as he gave it a 400 foot ride over the rightfield wall to give the Redbirds the W. The victory capped off a three game sweep of the Redlegs.
Check out the box score here: http://www.baseball-reference.com/boxes/SLN/SLN198405200.shtml