PITTSBURGH — Just when Robinson Cano is starting to hit, the New York Mets star appears headed back to the injured list.

Cano limped off with a strained left hamstring, an injury that overshadowed Noah Syndergaard’s sparkling outing in a 13-2 rout of the Pittsburgh Pirates on Sunday that pulled New York within one game of .500 for the first time since mid-June.

Cano is to have an MRI on Monday, when the Mets open a homestand with a doubleheader against Miami.

“We don’t know what it is yet. We just are going to get it checked out tomorrow,” Cano said. “We will see what happens.”

Cano lined a hit to right in the fourth inning, his third hit of the game and ninth hit in his last 15 at-bats. He pulled up after rounding first and grabbed at the back of his leg. Melky Cabrera threw to shortstop Kevin Newman, who tagged out Cano.

“Once I feel something, I just stop,” Cano said. “I don’t want to keep running and whatever it is, make it worse.”

In his first season with the Mets after being acquired from Seattle, the 36-year-old was limited to one game between May 22 and June 16 because of a strained left quadriceps. He is hitting .252 with 10 homers and 32 RBIs.

Pittsburgh, wearing the gold and black throwback uniforms of the Pirates 1979 World Series champions, lost its seventh straight series and is 4-18 since the All-Star break. The Pirates are last in the NL Central at 48-63.

J.D. Davis hit a 449-foot home run into the fourth floor of the left-field rotunda, on a first-inning changeup from Joe Musgrove (8-10).

Syndergaard (8-5) allowed three hits, singled twice and pitched shutout ball into the seventh. After allowing Bryan Reynolds to single with one out in the first, Syndergaard didn’t give up another hit until Jose Osuna doubled with one out in the seventh. Colin Moran hit an RBI single later in the inning.

Musgrove gave up eight runs and 10 hits in 3 1/3 innings, raising his ERA to 4.69.

“You’re going to have days like this,” Musgrove said. “I have to sharpen a few things between starts, but sometimes you just have weird days like this.”