Andy Murray pulls out of US Open because of 'too sore' hip injury

• Murray withdraws two days before start of final grand slam of year• 'I did pretty much everything I could to get myself ready,' says 2012 champion Andy Murray has pulled out of the US Open, which gets under way on Monday, because of the hip injury that has sidelined him since Wimbledon. Related: Maria Sharapova to face No2 seed Simona Halep in US Open first round