Red Sox’s streak of nine straight series wins snapped by Athletics

BOSTON — A 10th straight series win in their grasp, the Red Sox let it slip away when their two most dominant relievers faltered in the late innings in a 4-3 loss to the Athletics on Sunday afternoon at Fenway Park.

Instead, the Sox have lost a series for the first time since the Nationals took two out of three from them June 29-July 1.

“It’s been a minute,” interim manager Chad Tracy…