Logan Webb outdueled Luis Severino with eight shutout innings, Mike Yastrzemski capped a three-run fifth with a two-RBI single and the San Francisco Giants made it two in a row over the visiting New York Mets with a 5-1 triumph Tuesday night.

Michael Conforto had two hits against his former team for the Giants, including a single leading off the fifth that ended Severino’s perfect-game bid after he had retired the first 12 batters he faced.

Matt Chapman followed Conforto’s single with one of his own, setting up an RBI single by Thairo Estrada that ended the scoreless deadlock and Yastrzemski’s single to center field that gave the Giants a 3-0 lead.

That was plenty of support for Webb (3-1), who allowed a two-out double to Omar Narvaez in the third, a leadoff single to Starling Marte in the fourth, a two-out infield hit by Jeff McNeil in the fifth, a two-out double by Marte in the sixth, a leadoff single by Pete Alonso in the seventh and a two-out single by Marte in the eighth.

The Mets never advanced a baserunner past second as Webb issued just one walk and the Giants played error-free defense behind him.

Webb finished with four strikeouts in his eight innings as he won his third straight decision.

Severino (2-2) was pulled after six innings, having allowed just the three fifth-inning runs and a total of five hits. He struck out five and didn’t walk anyone.

The Giants tacked on against Drew Smith in the seventh when Estrada tripled, Yastrzemski completed a three-RBI night with another run-scoring single, and LaMonte Wade doubled to make it 5-0.

For the second night in a row, the Mets saved their best offense for the ninth inning, scoring on DJ Stewart’s infield out after Alonso had doubled and Brett Baty had singled off reliever Tyler Rogers.

McNeil’s single prompted Camilo Doval to be summoned from the bullpen, and the San Francisco closer needed just five pitches to record the final two outs for his fourth save.

Estrada collected a triple, a single and two runs, while Yastrzemski joined Conforto with two hits for the Giants, who were out-hit 9-8.

Marte (double and two singles), Alonso (double and a single) and McNeil (two singles) accounted for seven of the nine New York hits as the Mets, after taking two of three from the Los Angeles Dodgers, fell to 2-3 on their California swing.