Robinson Cano’s first season with the Mets might be finished.

Placed on the injured list Monday, Cano underwent an MRI exam, which revealed the second baseman suffered a torn left hamstring during Sunday’s win in Pittsburgh. No surgery is required, but there is no timetable for his return.

Cano, 36, once went nearly 11 years without landing on the disabled list, and played an average of 158½ games from 2007 to 2017, but is now on the injured list for the third time in less than three months. Whether he will remain there the rest of the season is unclear.

“That’s devastating,” manager Mickey Callaway said. “You just don’t know what’s next.”

Before his body broke down again, Cano had made breakthroughs at the plate.

Struggling during so much of his return to New York, the eight-time All-Star was 9-for-15 with a homer and four doubles in his past four games. Cano, who had been limited to 86 games due to previous injuries to his left quad and left calf, was batting .252 with 10 home runs and 32 RBIs.

After playing the first half of his 10-year, $240 million deal with the Mariners, Cano waived his no-trade clause in early December to come back to where he spent his first nine seasons. In GM Brodie Van Wagenen’s first, and boldest, offseason move, the Mets agreed to take on $63.5 million left on the aging, and declining, second baseman’s contract, in order to also land 25-year-old closer Edwin Diaz, who led the majors in saves (57) last year.

Cano, who played in just 80 games last season after being suspended for PED use, spent most of this season unrecognizable from the star who was on a Hall of Fame path with the Yankees. Repeatedly booed by fans at Citi Field for his struggles and lack of hustle, the career .302 hitter was batting .222 on June 27, and tied a career low by hitting four home runs before the All-Star break.

But even in the most disappointing season of his career, Cano helped spark the Mets’ second-half turnaround, hitting .289 with six homers and 14 RBIs, and breaking out for his first career three-homer game on July 23.

“It was hard for me to get four [home runs] the first half of the season … [but] I always stay positive,” Cano said then. “I know how hard I work, all the stuff that I do … I know it’s gonna turn around.”

It had. But another chance won’t come anytime soon.