MIAMI — On Friday, Pete Alonso faced the heat during and after a rough game that included a misplay that led to a Marlins run.

On Saturday, Alonso faced heat and demolished it.

What might be the final regular-season game of Alonso’s Mets career will have meaning Sunday, when the player and team will be playing for a shot at the postseason in large part because of his handling of Eury Pérez’s fastballs.

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In a 5-0 win over the Marlins in Game 161 at loanDepot Park, Alonso helped ensure Game 162 would matter.

“Pete setting the tone early on,” manager Carlos Mendoza said after the Mets could exhale

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