The best signing in Mets history could turn out to be one that owner Steve Cohen didn’t complete.

By that we mean the deal that fizzled in January that would have brought Carlos Correa to Queens on a mega-contract extending into the next decade.

Correa is off to a sputtering start with the Twins and hearing boos with the ink barely dry on the six-year deal worth $200 million he signed in the offseason. The Mets were prepared to pay him $315 million over 12 years until they reviewed his medicals and lowered their offer due to concerns about his ankle.

You think the Mets have problems now? Imagine Correa entrenched at third base with his .191/.272/.374 slash line and getting booed mercilessly at Citi Field.