Yes, everyone think of French champion 2009 should be belong to Nadal because he played so well in Monte Carlo, Rome, Barcelona (all clay tournament) and became runner-up in Madrid (lost to Federer). Why can't he even went through quarter-final...???
The main reason is that he was too confident. Do you remember how he defected Hewitt in third round so easy by straight set, without even sweating?
So, when he played on against Soderling in fourth round, I think he also think that he can easily beat him by straight set. Do you agree with me?
Frankly speaking, he was not in his form that day. Nadal like to play high ball. This give chance for Soderling to smash the ball and make him run here and there... finally he was so tired to return the ball.
Do you notice that when Federer beat Nadal in Madrid, Nadal always perform a weak return and finally he lost that game.
Murray also use such method to beat Nadal in US Open and many ATP tournament. Do you notice?