Coco Gauff of the United States serves during the women's singles match against Solana Sierra of Argentina in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
Coco Gauff of the United States returns the ball during the women's singles match against Solana Sierra of Argentina in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
Sebastian Baez of Argentina serves during the men's singles match against Taylor Fritz of the United States in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
Taylor Fritz of the United States competes during the men's singles match with Sebastian Baez of Argentina in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
Coco Gauff (R) of the United States poses with Solana Sierra (L) of Argentina before their women's singles match in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
Taylor Fritz (R) of the United States poses with Sebastian Baez of Argentina before the men's singles match in the Group A round robin match between the United States and Argentina at the 2026 United Cup tennis tournament in Perth, Australia, Jan. 3, 2026. (Photo by Zhou Dan/Xinhua)
