Japan's Yui Kamiji and her South African partner Kgothatso Montjane captured their second Grand Slam title of the year with a walkover win in Saturday's U.S. Open women's wheelchair doubles final.They were scheduled to face top-seeded Dutch pair Diede de Groot and Jiske Griffioen, who withdrew prior to the match.Kamiji and Montjane partnered to win the French Open in June and finished as runners-up to de Groot and Griffioen the following month at Wimbledon.Related coverage:Tennis:Tokito Oda's bid for 3rd straight Grand Slam title ends at U.S. OpenREAD FULL ARTICLE