DETROIT—Ryan Sweeney and Jack Cust hit back-to-back homers in the first inning as the Oakland Athletics handed the Detroit Tigers a 5-2 loss Wednesday.

Sean Gallagher came off the disabled list and pitched four hitless innings for the A’s, who have won four of five.

Oakland scored three runs in the fourth to take a 5-0 lead. Eric Patterson had an RBI single and Aaron Cunningham drove in two runs with a two-out single.

Armando Galarraga (12-6) allowed five runs and eight hits in four innings for Detroit, extending his winless stretch to four starts.