MILWAUKEE — The last time Corbin Burnes gave up six earned runs in one outing was nearly four years ago. Funny, since it felt like it had been four years since the Mets had scored any runs at all coming into Wednesday’s series finale against the Milwaukee Brewers.

After being outscored 19-0 over the first two games of the series, Pete Alonso made the sure Mets wouldn’t be shut out in the Badger State, belting two home runs off the 2021 NL Cy Young Award winner Wednesday afternoon at American Family Field. But the pitching problems persisted and Garrett Mitchell hit an absolute moonshot off Adam Ottavino (0-1) in the ninth to walk it off for the home team.

The Brewers (5-1) won 7-6 to complete the sweep of the Mets (3-4). Devin Williams earned the win with a scoreless inning of relief.

Alonso tied the game in the third inning with a two-run homer off of Burnes. The Mets went up 1-0 in the first but a blowup by David Peterson in the second left them down 3-1. After Starling Marte doubled with one out, Francisco Lindor sent him home on a single to right. Alonso, newly shaven after starting the season mustachioed, then hit one nearly 106-MPH off the bat into the right field stands to tie the game at 4-4.

He broke the tie in the fifth inning with his second home run off Burnes, depositing this one into the Brewers’ bullpen in left-center field, as if to summon a reliever.

It was the most runs allowed by Burnes since May 17, 2019, when he gave up seven to the Atlanta Braves.

But the lead was short-lived.

Peterson walked Christian Yelich to lead off the bottom of the fifth and was quickly replaced by Drew Smith, who got the first out of the inning but failed to retire former Yankees slugger Luke Voit. Voit singled to left and promptly stole second base. Smith left a changeup up and Jesse Winker drove it to right field, scoring Yelich and Voit easily and handing the lead back to the Brewers.

Milwaukee scored 26 runs over three games against the Mets, a glaring number for a team that’s supposed strength is pitching. Peterson was charged with five earned runs on five hits, he walked five and struck out five over only four innings (plus one batter in the fifth).

Burnes gave up six earned on seven hits, walked two and struck out three over 4 1/3 innings.

The Mets are finally heading home to play their first series of the season at Citi Field against the Miami Marlins. But after this series, the Mets may encounter a more hostile crowd than what is typically anticipated for the home opener.

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