Mookie Wilson scored from second base on an infield out in the 12th inning to give the New York Mets--held hitless for 8 1/3 innings by rookie Jose DeLeon--a 1-0 victory over the Pittsburgh Pirates and a sweep of their doubleheader yesterday in Shea Stadium.

In the opener, Bob Bailor's 12th-inning, bases-loaded single scored Darryl Strawberry with the winning run and gave the Mets a 7-6 victory.

Manny Sarmiento (3-5) entered the second game in the 12th and allowed a leadoff single to Wilson. Hubie Brooks, who had broken starter DeLeon's no-hit bid with a one-out single in the ninth, sacrificed Wilson to second. Keith Hernandez was intentionally walked, putting runners on first and second.

George Foster grounded to second baseman Johnny Ray, who threw to Dale Berra at second to force Brooks. Wilson kept running around third base and beat Berra's slightly high throw to the plate.

Jesse Orosco (7-5), who won the first game, also won the nightcap in relief of Mike Torrez, who yielded eight hits over 11 innings.

DeLeon, asked about the pitch he threw to Brooks, said, "He hit a good pitch, no doubt about it. I felt a lot of pressure, but I said to myself I might as well go for it."