Coco Gauff loses singles but US makes United Cup quarterfinals with win over Spain

The US has secured a United Cup quarterfinal berth after Coco Gauff made up for a shock singles loss by helping win the deciding mixed doubles rubber against Spain.

World number four Gauff recorded 54 unforced errors and served 14 double faults en route to a 6-1, 6-7 (3-7), 6-0 loss to Spain’s…