Bill Madlock hit reliever Ron Reed's first pitch for a home run to lead off the bottom of the ninth inning last night in Pittsburgh and the Pirates set down Philadelphia, 10-9. The result, combined with St. Louis' victory over the New York Mets, ousted the Phillies from first place in the East Division as the Cardinals reclaimed a half-game lead.

Manny Trillo's infield hit scoring Mike Schmidt had tied the game in the top of the ninth after Pittsburgh took a 9-8 lead in the seventh on Mike Easler's two-out RBI single and a two-run pinch double by Willie Stargell. Dave Parker led off that rally with a pinch-hit triple, his first appearance since July 28 when he went on the disabled list with ruptured ligaments in his left thumb.

Kent Tekulve (11-8), who took over as Priate pitcher in the ninth inning, benefited from Madlock's 17th homer on a night when his team mounted an early 6-0 lead only to fall behind, 8-6, in the middle innings.

Madlock had a run-scoring single and an RBI double as the Pirates jumped on starter Mike Krukow for six runs in the first two innings. Schmidt's 32nd home run of the year, with two on, helped the Phillies come back.