Jacob deGrom pitched one-hit ball over five scoreless innings as the Mets beat the Atlanta Braves 4-2 Monday in a doubleheader opener.

DeGrom (7-2) didn’t allow a hit in the seven-inning game until Mets outfielders misplayed a fifth-inning fly ball into a ground-rule double.

Jeff McNeil came off the injured list and singled as a pinch-hitter for deGrom during the fifth, then scored on Dominic Smith’s three-run double.

Seth Lugo and Edwin Díaz finished the two-hitter, with Díaz getting his 15th save.

Kyle Muller (0-1) pitched one-hit ball over four innings in his first big league start.

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