Lou Whitaker singled home Enos Cabell from second base with two out in the 10th inning to give host Detroit the victory and prevent Baltimore from clinching a tie for the East pennant.
Enos Cabell singled off Sammy Stewart (9-4) and one out later, Stewart wild-pitched Cabell to second and Rick Leach was walked intentionally. Dan Morogiello relieved and got Lynn Jones on a pop up before Whitaker delivered a line single to left for his fourth hit of the game.
A Baltimore victory would have assured the Orioles at least a tie for the AL East title. Instead, the Orioles' lead over the second-place Tigers shrank to 7 1/2 games and the magic number remained at three.
The Tigers tied the score at 4 in the ninth on a one-out walk to pinch hitter Johnny Grubb, a passed ball and a single by Whitaker.
Eddie Murray, hitting .424 over his last 14 games, gave the Orioles a 2-0 lead in the first inning when he followed a walk to Cal Ripken with a 450-foot homer to center.
Baltimore trailed, 3-2, when Murray came up with two out in the seventh and hit another homer, tying the score. John Lowenstein beat out an infield hit, Ken Singleton walked and Joe Nolan singled to put the Orioles ahead, 4-3.