Dan Petry won his first game since Aug. 23 and Chet Lemon and rookie Mike Laga homered as the Tigers defeated the Boston Red Sox, 5-1, last night in Detroit.

Petry (15-8) has beaten Boston only three times. He struck out three and walked five in 8 2/3 innings.

"Sure it was the (four) double plays, but the double plays are made by the pitching you have," Detroit Manager Sparky Anderson said. "Petry made some great pitches out there. The only times they hit the ball hard is when he gets them up, but they were hitting bloopers tonight."

Petry lowered his earned run average to 2.97. He had missed two starts with a stiff back.

"You begin to wonder if we're in a slump or their pitchers are that good, or what it is," Boston Manager Ralph Houk complained.

In the fourth inning, Laga hit his second homer this season, off Brian Denman (2-2). The Tigers made it 5-0 in the sixth on Lemon's two-run homer, his 15th.

Petry did not allow a run until two were out in the ninth. Carney Lansford walked and consecutive singles by Wade Boggs and Reid Nichols scored Lansford, bringing on Aurelio Lopez in relief.