Isaac Collins led off the ninth inning with a walk-off homer for the red-hot Milwaukee Brewers, who stormed back from a five-run deficit to stun the reeling New York Mets, 7-6, and sweep their three-game series.

The Brewers have won nine straight and 12 of 13 to improve their MLB-leading record to 73-44. The Mets, who squandered leads in all three games this weekend, lost their seventh straight and fell for the 11th time in 12 games as their lead over the Cincinnati Reds for the final National League wild-card spot dropped to 1 1/2 games.

The Brewers, who trailed 5-0, began their comeback when William Contreras homered to lead off the fourth before Joey Ortiz laced a two-run single. Pete Alonso had an RBI double in the fifth for the Mets before Contreras added a homer in the fifth, a two-run shot, to cut the lead to 6-5.

Contreras was stranded at third in the seventh when Andrew Vaughn hit into an inning-ending double play, but the Brewers tied the score in the eighth. Pinch-hitter Brice Turang worked a leadoff walk against Ryan Helsley, went to second on Danny Jansen's one-out single and scored on Ortiz's single past a diving Alonso.

Edwin Diaz (5-2) relieved Helsley and stranded two by retiring Anthony Seigler on a line out. After the Brewers' Nick Mears (3-3) tossed a hitless ninth, Collins homered just beyond the right-field fence on Diaz's fifth pitch to set off a celebration.

The Mets, who scored in each of the first five innings, took their lead thanks to RBI singles by Juan Soto, Jeff McNeil and Ronny Mauricio and homers by Brett Baty and Cedric Mullins.

Neither starter factored into the decision following abbreviated starts.

The Brewers' Quinn Priester allowed six runs on 10 hits and one walk while striking out two, though Milwaukee's comeback allowed him to maintain his unbeaten streak dating back to May 30 (10 starts, three appearances).

Mets left-hander Sean Manaea gave up four runs on six hits and two walks while striking out five over four-plus innings.