US Open: 2017 champion Sloane Stephens knocked out in first round, Coco Gauff wins on debut
Tennis | August 28, 2019 9:40 ISTSloane Stephens was defeated 3-6, 4-6 by Anna Kalinskaya while Coco Gauff defeated Anastasia Potapova 3-6, 6-2, 6-4 in the first round of US Open.