Lou Piniella, who entered yesterday's game with five RBI, drove in five runs and Matt Keough became his team's first right-handed starter to win a game this season as the streaking Yankees beat the Milwaukee Brewers, 8-3, in New York.

In his first appearance since being acquired Wednesday from Oakland, Keough (3-3) yielded three runs and five hits over 5 1/3 innings as New York won its fifth straight. George Frazier bailed Bob Shirley out of a two-on, one-out jam in the seventh and finished for his third save.

The Yankees have scored 36 runs during their winning streak.

"I've always liked to hit with men on base," said Piniella, who had been batting only .200 with men in scoring position, "but earlier in the season . . . I wasn't doing my job."

Ben Oglivie's bases-loaded single and an RBI forceout by Marshall Edwards helped Milwaukee tie at 3 in the fourth, but the Yankees broke open the game with a four-run fifth. After leadoff singles by Ken Griffey and Roy Smalley, Dave Winfield advanced both with a fly to deep left.

Don Baylor was walked intentionally to load the bases and Piniella grounded a two-run single through the box. Center fielder Rick Manning's throw to third skipped by Don Money as Baylor scored and Piniella was awarded third. Graig Nettles then hit an RBI grounder.

In the third, Piniella grounded a two-run double past Money--who came on when Paul Molitor was ejected in the first for protesting a called third strike.

Piniella's seventh-inning single scored Baylor, safe on a two-base error by left fielder Ed Romero.