MILWAUKEE — Pete Alonso was having a rather disappointing evening in what could have been his final game for the New York Mets.
Then everything changed with one swing of the bat.
The slugger broke out of a prolonged slump by smashing a three-run homer off closer Devin Williams in the ninth inning to put the Mets up for good in a 4-2 victory over the Milwaukee Brewers on Thursday in the decisive third game of their NL Wild Card Series.
That made Alonso the first major leaguer to hit a go-ahead homer when his team was trailing in the ninth inning or later of a winner-take-all postseason game, according to OptaSTATS.
''It's just something you practice in the backyard as a kid,'' Alonso said. ''You go through those scenarios as a little kid: All right, you're in the playoffs down by a few runs. Words can't explain. This is just unreal.''
Alonso and the Mets advanced to a best-of-five Division Series beginning Saturday in Philadelphia against the NL East champion Phillies.
The night could have turned out much differently for Alonso.
Milwaukee took a 2-0 lead in the seventh on back-to-back homers from pinch-hitter Jake Bauers and Sal Frelick, and was threatening to add on. The Brewers had runners at second and third with two outs when William Contreras hit a foul pop toward the stands that Alonso was unable to catch against the protective netting, giving the All-Star catcher one more chance to drive in some runs.