DAY 2: ROLAND GARROS, FRANCE AMERICANS [19] Sloane Stephens def. [55] Margarita Gasparyan (RUS) 6-4, 6-3 [23] Jack Sock def. [86] Robin Haase (NED) 6-3, 7-5, 3-6, 6-7(3), 6-2 Coco…