Japan's Yui Kamiji won back-to-back U.S. Open women's wheelchair tennis singles titles, while compatriot Tokito Oda was stopped in his bid for a calendar Grand Slam in men's wheelchair singles on Saturday.Top seed Kamiji defeated second-seeded Diede de Groot of the Netherlands 6-2, 1-6, 6-3, securing her fourth U.S. Open title and her second straight major, following her Wimbledon triumph."I'm really happy," Kamiji said. "I focused entirely on what kind of shots to hit to keep my opponent off balance, and it worked. I'm satisfied with my performance."No. 1 seed Oda lost 6-0, 7-6 to second-s…READ FULL ARTICLE