Andy Murray has withdrawn from next week's Cincinnati Masters as he continues to recover from a hip injury.

The Scot has not played since limping out of Wimbledon at the quarter-finals stage in early July.

Murray, 30, said he remained hopeful of recovering in time for the US Open, which starts on August 28.

He is now certain to lose his world number one ranking to either Roger Federer or Rafael Nadal before the final Grand Slam of the year.

He said: "Unfortunately I won't be playing in Cincinnati as I continue my recovery.

"I'm continuing to work hard on the court with the aim of being in New York."