NEW YORK — It’s a fantastic weekend to be in Port St. Lucie, Fla. In a huge step, Jacob deGrom will make his first rehab start on Sunday for Single-A St. Lucie at Clover Park. DeGrom will face the Jupiter Hammerheads, the Marlins’ Single-A affiliate, under the lights at 6:10 p.m. The Mets ace is expected to throw around two innings and 25 pitches. It will be his first time facing another opponent since spring training in March, when he was diagnosed with a stress reaction on his right scapula. He last pitched in a major league game on July 7, 2021. “Every day we can check a box off is a day we…