Why won’t Coco Gauff and Iga Swiatek play in the Billie Jean King Cup after WTA Finals?

Coco Gauff will not be part of the American team for the upcoming Billie Jean King Cup Finals, while Iga Swiatek has opted out for the second year in a row. The US team will consist of Madison Keys, Sofia Kenin, Danielle Collins, Sloane Stephens, and Taylor Townsend.