Backdoor Slider

Some articles on backdoor slider:

1988 World Series - Matchups - Game 1
... for a moment and when he stepped back in, he hit a backdoor slider into the right field bleachers to win the game ... hitter, one could be absolutely certain that Eckersley would throw a backdoor slider ... back into the batter's box and thus when Eckersley did in fact throw a backdoor slider, it was, thanks to Didier, exactly the pitch Gibson was looking for ...