PHILADELPHIA — The last time the Mets came back to win a game after being down in the eighth inning or later, it was when Pete Alonso hit that infamous home run in Game 3 of the Wild Card series against the Milwaukee Brewers last October. Alonso was floored when heard, thinking the Mets had to have had a ninth-inning comeback at some point this season.

Wrong: The Mets are 0-60 when trailing after the eighth inning this season.

“That’s kind of tough to wrap my mind around,” Alonso told the Daily News this week in Philadelphia. “I’m puzzled.”

So is everyone else in Queens.

The Mets have lost their last three by a margin of only five runs, with comeback opportunities in the eighth and ninth innings each time. Monday night, trailing the Phillies by 1-0, the Mets had runners on second a

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