US Open: Laura Robson knocked out of US Open
Britain's Laura Robson has been knocked out of the US Open.
China's Li Na took her win in straight sets in one hour and 21 minutes.
Li who is sixth seed won by 6-2 7-5.
At last year's US Open Laura made a name for herself after she managed to beat both Li and Kim Clijsters, taking her to the fourth round for the first time.