The new tennis season is just five days away, and we're counting down to first serve with 10 burning questions.
Sixth: The semifinals of the women's US Open tournament was entirely comprised of Americans—and not one of them was Serena Williams. With Serena rejoining Sloane Stephens, Madison Keys, CoCo Vandeweghe and her sister, Venus, this season, which American women will fare best in 2018?