Andy Murray believes he is developing the physical fortitude to perform at the top level week in and week out on the ATP Tour.

Andy Murray spoke of his increasing confidence under new coach Brad Gilbert after reaching the semi-finals of the Legg Mason Classic in Washington with a straight-sets victory over Mardy Fish.

Five-time former champion Andre Agassi withdrew from the Legg Mason Tennis Classic on Monday in order to take a break ahead of the upcoming US Open.

Tim Henman joined fellow Brit Greg Rusedski in crashing out of the US Open at the first hurdle after going down 6-3 7-6 (7-2) 6-3 to fourth seed Andy Roddick in New York.