Murray keen to win another grand slam before turning 30

By Simon Cambers NEW YORK (Reuters) - With a second Wimbledon title in the bag, a second gold medal in his pocket and his biggest rival struggling with injury, Andy Murray believes he has a golden chance to add to his three grand slam titles. The second-ranked Scot, who has lost just twice since early May, is favoured by some to dethrone an ailing Novak Djokovic next week and win a second U.S. Open title, though the Serbian top seed remains the favourite with bookmakers. At 29, Murray knows that