Padres struck out Jeeter, he even began walking away from the plate. The ump called it foul. All video replays showed essentially a perfect pitch. Even the commentators couldn't see how it was a foul.
It essentially turned the tide of the world series as Jeter would go on to hit a home run. The Yankees had hitherto been getting their butts kicked. But when you have to pitch 4 strikes, it changes all the odds. This will eliminate a LOT of bought off umps as well.
Jeter didn't have any home runs in the 1998 World Series. Other than that, good story.
What you may be referring to is the 2-2 pitch to Tino Martinez in the 7th inning of game 1. With the bases loaded and two out, Tino took a pitch that was probably a strike. The umpire called it a ball and then Tino hit the next pitch in the the upper deck giving the Yankees a 9-5 lead. Of course at that point, the game was already tied. The Yankees ended up sweeping the Padres so it may be difficult to blame 1 pitch.