David Stearns hasn’t even taken over the Mets yet and things are already looking up.

On a day it was learned the former Brewers executive would become Mets president of baseball operations, the Mets went out and beat the Diamondbacks, 7-4, at Citi Field.

Ronny Mauricio, who has at least given the Mets a bit of a spark since his call-up this month, hit his first major league homer in the fourth — one of three home runs hit by the Mets, with Pete Alonso adding his 44th and Francisco Alvarez No. 23.

Brandon Nimmo added three extra-base hits and Jose Butto pitched five strong innings, but the bullpen faltered before Adam Ottavino got Corbin Carroll to hit into an inning-ending double play with the bases loaded in the eighth.

The switch-hitting Mauricio continues to show power from the left side, as his blast to right was another rocket — measured at 112 mph and 440 feet.

Prior to the game, Buck Showalter reiterated that he intends to play Mauricio at multiple positions before the season ends.

After coming up through the minors as a shortstop, the Mets moved Mauricio to different spots in the minors this season, but he’s only played second base since making his MLB debut.

He was there again Tuesday and he gave the Mets a two-run lead with his two-run homer.

Mauricio is about the only young Met hitting well these days, as Brett Baty entered in an 0-for-14 slump and Mark Vientos was hitless in a dozen at-bats before his second-inning single.

And Alvarez has had a rocky couple of months.

But Mauricio has produced and on Tuesday, so did many of his teammates.

Alonso, after going 11 games without a homer, has hit five in his last eight games.

Things got interesting in the eighth, when Sam Coonrod entered and allowed five of the six batters he faced to reach base.

With the bases loaded and one out, the right-hander hit Seby Zavala with a pitch to force in a run. Coonrod then walked the No. 9 hitter, Geraldo Perdomo, to cut the Mets’ lead to two runs.

Ottavino came in to face the leadoff hitter, Carroll, and immediately got the double play to end the inning.

Right-hander Sean Reid-Foley was placed on the 15-day IL with a right lat strain on Tuesday after he pitched a scoreless inning — and struck out three — in Monday’s loss to Arizona.

Buck Showalter said Reid-Foley mentioned a potential physical issue shortly after the outing.

He appeared in eight games with the Mets after coming back from Tommy John surgery he underwent in May 2022.

Reed Garrett was recalled from Triple-A Syracuse to replace Reid-Foley in the bullpen.