The Mets hit the halfway mark in the season on Thursday and found another ugly way to lose.

There was another lackluster showing from the offense and a poor showing from a low-leverage reliever in a 3-2 loss to the Brewers, as the Mets lost for the fourth time in five games and are now a season-worst nine games under .500 (36-45).

They had a chance against Milwaukee closer Devin Williams in the ninth after Mark Canha walked with one out and Francisco Alvarez singled.

Brett Baty had already been removed from the game for pinch-hitter Danny Mendick in the seventh, so Buck Showalter had to go to light-hitting Luis Guillorme in the ninth.

Canha stole third, and Guillorme grounded to first, moving Alvarez to second.

Brandon Nimmo walked to load the bases, but Starling Marte struck out to end it.

Back-to-back homers by Baty and Nimmo in the third gave Max Scherzer a 2-0 lead, but Scherzer gave up a two-run shot to Victor Caratini in the sixth to tie the game.

Showalter went to T.J. McFarland in the seventh, and he allowed two of the three batters he faced to reach base before Dominic Leone entered and gave up an infield hit to pinch-hitter Owen Miller.

Brian Anderson’s ensuing sacrifice fly gave Milwaukee the lead for good.

The Mets weren’t done teasing the fans at Citi Field, though, as Canha, pinch-hitting for Daniel Vogelbach to start the bottom of the inning, singled to center against lefty Hoby Milner.

Alvarez flied out and Mendick, hitting for Baty, hit a potential double-play ball to third, but Anderson booted it, and the Mets had runners on the corners for Nimmo, who was hit to load the bases.

Marte grounded into an inning-ending double play, drawing boos from the crowd.

After Scherzer cruised through the top of the first, he allowed consecutive one-out singles to Anderson and Caratini in the second to put runners on the corners.

But he got Brice Turang on a liner to short and Blake Perkins on a deep fly to left to strand two.

With the Mets in a tailspin, even when they catch a break, they have a hard time taking advantage of it.

Pete Alonso led off the bottom of the second with a pop-up down the right-field line.

Turang, the second baseman, dropped his running attempt at a catch, but Alonso was overly aggressive and was thrown out at second by Perkins from right field.

Later in the inning, Jeff McNeil’s two-out double to left was wasted when Vogelbach was robbed of a run-scoring single by Turang, who made a diving play to his right and a strong throw to first.

Scherzer stranded two more runners in the third following back-to-back walks with one out, striking out Willy Adames and getting Rowdy Tellez to ground out.

Baty gave the Mets the lead in the bottom of the inning with a one-out solo homer to right.

It was the rookie’s fifth home run of the season.

Nimmo followed with an opposite-field home run to make it 2-0.

Scherzer had a lengthy conversation with home-plate umpire Ron Kulpa as he walked off the field following the top of the fourth and after a scoreless fifth, the Brewers finally got to him in the sixth.

Tellez led off with a single and with one out, Caratini hit a two-run homer to center to tie the game at 2-2.

Scherzer left after throwing 102 pitches and was replaced by McFarland, who gave up an infield single to pinch-hitter William Contreras and then hit Adames before giving way to Leone.