Misty May-Treanor and Kerri Walsh of the United States have won gold in the all-American final of the women's beach volleyball at Horse Guards Parade.

The duo claimed their third consecutive Olympic title after they defeated number six seeds Jennifer Kessy and April Ross in straight sets.

The first set was evenly matched and was all-square at 13-13 but then the experienced May-Treanor and Walsh opened up a three-point gap as they looked to take a 1-0 lead.

Good defensive work by Walsh and a kill at the net edged the double Olympic champions closer to an early advantage, with a fault by Kessy handing them five set points.

Ross saved a point with an attack but she could only delay the inevitable as May-Treanor fired her team to a first-set win.

Both teams fought hard to gain an edge in the second set, with Ross and Kessy pegging back their opponents with a well-timed ace to pull back two points and take it to 7-7.

However, three straight errors allowed May-Treanor and Walsh to pull away and they then powered to victory with four match points to spare.