The starting rotation, which carried the Twins to a 13-game winning streak last month that turned their season around, is now the team’s biggest concern. Nothing went right for Bailey Ober, who surrendered a home run on his second pitch Thursday.

Left-hander Patrick Corbin (4-5) pitched five innings for the victory. He was chased with none out in the sixth inning when Ty France, Royce Lewis and Willi Castro each hit safely — Castro’s a run-scoring double — and Brooks Lee drove in a run with a groundout off reliever Hoby Milner to make it 13-3.