Mere months ago, a night like this wouldn’t have seemed possible for the Mets .

Jonah Tong wasn’t even invited to big-league spring training.

The first time he met manager Carlos Mendoza, Tong was serving as the ballboy in a Triple-A game during camp, fulfilling a right of passage as one of the newbies.

Tong began the regular season with Double-A Binghamton, where, to that point, he had made only two starts.

He was light years away from the majors.

But fast forward to Friday night, and there Tong was on the Citi Field mound, making his much-hyped MLB debut against the Miami Marlins.

And Tong demonstrated much of the promise that’s turned him into one of the Mets’ most prized prospects.

Tong allowed four runs (one earned) over five innings in the Mets’ 19-9 victory, striking out

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