Tennis U.S. Open singles 18 September, 2015 11:59 IST 18 September, 2015 11:59 IST Novak Djokovic... the men's champion. 1/6 Roger Federer... the men's runner-up. Photo: AP 2/6 Novak Djokovic is congratulated by Roger Federer. Photo: AP 3/6 Flavia Pennetta... the women's champion. Photo: AP 4/6 Roberta Vinci... the women's runner-up. Photo: AP 5/6 Flavia Pennetta is greeted by her good friend Roberta Vinci after the final. Photo: AP 6/6 Read more stories on Tennis.