Ron Guidry became the AL's first 15-game winner yesterday as the New York Yankees defeated the Red Sox, 5-3, in Boston, to complete a three-game sweep and extend their winning streak to six games.

Guidry, who has lost four times and has won 13 of his last 14 decisions, allowed five hits and one run in seven innings before giving up two unearned runs in the eighth. He walked one and struck out four. Brian Fisher retired the last four batters for his fifth save.

Ken Griffey had a double and two singles and drove in two runs for the Yankees while Don Mattingly also had a double and two singles and scored three times.

Boston's Roger Clemens (7-5), making his second start since coming off the disabled list Aug. 3, allowed three hits and one run before tiring in 96-degree weather and leaving the game after five innings.

The Yankees scored twice off Steve Crawford in the sixth and twice in the seventh as the Red Sox lost for the fourth time in five games. Boston has lost nine of 13.

Yankees Manager Billy Martin was given medical approval to be in uniform yesterday after undergoing a hospital examination for a bronchial condition, the club said.

Martin, who recently suffered a punctured lung from an injection in Texas, went to St. Elizabeth's Hospital after the Yankees' 7-3 victory over the Red Sox Saturday.