MILWAUKEE — The intrigue surrounding Zac Thornton isn’t about to dissipate anytime soon.

For a second straight start, the rookie left-hander worked at least six innings for the Mets and departed without allowing a run.

What’s not to like?

His attack-the-strike-zone approach is refreshing, as veterans such as Freddy Peralta and Kodai Senga in particular continue to struggle on that front.

On Tuesday, Thornton carried the Mets to a 4-0 victory over the Brewers at American Family Field for the team’s third win in five games since the All-Star break.

Thornton pitched six shutout innings, allowing three hits and one walk with two strikeouts.

It followed his seven scoreless frames against the Red Sox on July 12, and in his previous start he surrendered only one earned run over six innings against the Phillies. The opposition has been challenging.

David Peterson’s trade to the Cubs last month created the opening for Thornton, and he’s seized the moment.

This latest gem lowered his ERA to 1.93 over four career major league starts.

Another young pitcher who has excelled, Christian Scott, is set to face the Brewers in Wednesday’s series finale. Those two arms have joined rookie Nolan McLean to give the Mets a starting pitching nucleus worth celebrating.

Jared Young’s second-inning homer against Brandon Sproat gave the Mets a 1-0 lead. Young’s blast was his seventh of the season, continuing his left-handed offensive contributions at first base, where he has provided a measure of respectability for the Mets this season.

Thornton received a defensive boost in the third when Carson Benge snagged Joey Ortiz’s sinking line drive on a dive in left field for the second out. Thornton began his night by allowing a single and walk in the first inning but escaped by getting Andrew Vaughn to ground into a double play. The single he allowed to Jackson Chourio easily could have been ruled an error on Marcus Semien, who misplayed the grounder.

Sproat, who was once the Mets’ top pitching prospect — he got traded to the Brewers with Jett Williams for Peralta and Tobias Myers in January — lasted 4 ²/₃ innings and surrendered two earned runs on two hits and four walks with four strikeouts.

“On a personal level, I have a ton of respect for Brandon, the way he went about his job with us,” said Andy Green, who served as the organization’s farm director before becoming interim manager last month. “He works incredibly hard and he’s a great person, a great teammate. You pull for those guys, but at the same time you face him today, you go hard in the other direction.”

Benge stroked a two-run double in the fifth after Sproat walked the final batter he faced, Bo Bichette. Francisco Lindor doubled ahead of Benge’s hit that gave the Mets a 3-0 lead.

Thornton surrendered the Brewers’ first legitimate hit in the sixth on Cooper Pratt’s sinking line drive that just eluded A.J. Ewing’s glove in right field. Ortiz also singled in the inning.

Thornton escaped with help from Benge’s tumbling catch on the warning track in left field on Brice Turang’s fly ball.

Luis Robert Jr. smashed a 451-foot homer to left in the eighth that gave the Mets a 4-0 lead. Robert was activated from the injured list a day earlier after missing 2 ½ months.