Kim Clijsters is out of the 2011 French Open and it was a shocking upset. She lost in three sets to Aranxta Rus of The Netherlands with the scores of 3-6, 7-5, 6-1.
The really amazing thing about the match is that Clijsters had 65 unforced errors. In tennis, an unforced error is a shot that the player simply messes up. This can be hitting it into the net, hitting it long or other things. The determining factor in an unforced error is that your opponent has done nothing to cause you to mishit or misplay a ball. At most levels of tennis, unforced errors can be the difference between winning and losing since it forces your opponent to make winning shots against you.