US Open: Andy Murray is a hunted player - John McEnroe

Tennis great John McEnroe says Andy Murray will be "hunted" as the British number one tries to defend his US Open men's singles title.

With a Wimbledon win also under his belt, Murray's rivals will be "gunning for him", according to McEnroe.

The four-time US Open champion expects world number one Serena Williams to be "head and shoulders above the rest" in the women's singles.