Jason Bay showed the kind of pop that prompted the Mets to give him that big contract.

The outfielder hit his fifth career grand slam in the Mets' five-run first inning and New York earned a three-game series sweep over the Miami Marlins with a 5-1 win on Sunday.

"It didn't feel any different — that was the weird part. My first start in a week or whatever it's been, but I've done this a million times, it wasn't really that awkward," Bay said.

Chris Young (4-7) allowed one run and five hits in five innings. He walked one and struck out three as the Mets won for the seventh time in eight games.

The Mets wasted little time in getting to Mark Buehrle (12-12).

Ronny Cedeno led off the game with a double to deep center field and took third on Justin Turner's double. Turner hit a fly down the right-field line, where the ball landed just inside fair territory as right fielder Mike Stanton overran it.