Ron Jackson scored in the fourth inning and singled the tie breaker across in the eighth to back the four-hit pitching of Dan Petry in Detroit yesterday and help return the Tigers to first place in the American League East with a 2-1 triumph over the Milwaukee Brewers.

Kirk Gibson carried the winning run home. He singled, stole second and came in on Jackson's hit to right.

Petry (10-8) retired 12 batters before yielding the first Brewer hit, a single by Ted Simmons. He struck out six and walked one.

Jackson doubled leading off the fourth, went to third when pitcher Randy Lerch (7-8) tumbled over catcher Simmons after catching a foul ball between home and first, and scored on a wild pitch for a 1-0 Detroit lead.

The Brewers caught up in the seventh. A 30-mile-per-hour wind blew Robin Yount's pop fly for a double, Cecil Cooper's sacrifice moved Yount to third and Yount scored on Simmons' ground hit through the right side.

The Brewers, winners of two of three in the weekend Detroit series, will wind up the season at home against Boston and Detroit. The Tigers play host to Baltimore for three games before heading to Milwaukee for a three-game showdown that might be decisive in the "second-season" division race.