PARIS — The top American tennis player Coco Gauff is out of the Olympic women’s singles under controversial circumstances after a 6-7, 2-6 defeat to Croatia’s Donna Vekic on Court Philippe-Chatrier at Roland Garros. A high-quality contest was overshadowed by a disputed line call at a crucial juncture in the second set, prompting Gauff to say, “I feel like I’m …
