Sid Fernandez and Roger McDowell pitched a one-hitter and struck out 13 yesterday as the New York Mets earned their fifth straight victory, beating the Philadelphia Phillies, 4-0, in New York.

New York right fielder Darryl Strawberry tore ligaments in his right thumb while making a diving catch of a ball hit by Juan Samuel in the third inning.

"Surgery is a possibility," said Frank Cashen, Mets general manager. "If he does have surgery, they estimate he'll be in a cast for four weeks with two weeks of therapy."

The injury will be re-evaluated this morning, when the swelling is expected to be reduced.

Fernandez, activated before the game after a month in the minors, allowed only Von Hayes' leadoff single in the fourth. He struck out a career-high nine and walked six in six innings. McDowell walked one and struck out four to get his first save.

The shutout was the third straight for the Mets, who have allowed nine hits in 27 innings. New York has won nine of 12 and has the best record in baseball, 18-8. The Phillies have lost five in a row.

Mookie Wilson led off the Mets' first with a single, went to third on a single by Kelvin Chapman and scored on a ground out by Keith Hernandez. Wilson doubled with one out in the third, stole third base and scored on Chapman's sacrifice fly.