J.R. Perdew pitched a four-hit shutout as George Mason defeated University of North Carolina-Wilmington, 3-0, in a Colonial Athletic Association baseball game yesterday at George Mason.

George Mason is 21-16-1 overall, 7-7 in the league. UNC-Wilmington is 26-23, 8-7.

*East Carolina 11, American 5: Winfred Johnson, who earned the save for East Carolina (33-5, 12-3 in the CAA), homered and scored two other times as the Pirates broke open a 4-4, eighth-innning tie.

American is 6-20, 1-11.

*James Madison 3-10, Howard 2-5: Scott Mackie hit a two-run homer in the seventh to lift the Dukes (27-9) over the Bison (20-13) in the first game of a doubleheader at Harrisonburg, Va. Glen Deren went two for four in the second game, including a tie-breaking three-run homer in the fourth inning.

David White (7-2) lost the opener. Glen Abraham (3-3) lost the second game.

*Virginia 15, Wake Forest 12: Bill Narleski went five for six with two doubles and three RBI to lead the Cavaliers (22-15, 4-7 in the Atlantic Coast Conference) over the Demon Deacons (24-27, 6-7) at Layton Field in Winston-Salem, N.C.

*Georgetown 11, Pittsburgh 4: Catcher Bill Pendley and third baseman Mike Moss each drove in three runs as the Hoyas won a Big East game in Pittsburgh. Georgetown is 14-15, 8-4. Pitt is 2-18, 1-11.

*Navy 2-11, Harvard 1-1: Senior Mike Leeney went four for eight with five RBI as the Midshipmen (24-8, 13-3 in the Eastern Intercollegiate Baseball League) swept the Crimson (10-6, 4-4) at Cambridge, Mass. Navy has won 12 straight league games. In the nightcap, sophomore Steve Wieman (6-0), from Bowie High School, threw a six-hitter.

*Duke 19, Maryland 15: The Blue Devils (25-18, 2-12 ACC) overcame a 12-11 deficit with eight runs in the eighth inning in Durham, N.C. Duke had six singles in the eighth inning, sending 12 batters to the plate in both the seventh (six runs) and eighth. Maryland is 8-17-1, 1-8.

*Track and Field: Harold Morton of George Mason finished second in the 110-meter high hurdles in 13.83 in the Martin Luther King Freedom Games in Atlanta. With that performance, Morton qualified for the NCAA track and field championships June 4-7 in Indianapolis.

George Mason's team of Morton, Gary Powell, Brian West and Brian Banks finished third in the mile relay in 3:08.2. The Patriots team of Morton, Powell, West and Keith Young finished fourth in the 400-meter relay in 40.72.

*Crew: Navy's lightweight varsity eight and second varsity boats defeated Coast Guard in New London, Conn.

The varsity eight finished in 5:47.8 to Coast Guard's 5:58.4. In the second varsity race, the Midshipmen won by six seconds . . .

In New York, the Columbia women's varsity eight (7:38.8) held off a late rush by Navy's varsity eight to win by :02.