Tursunov's record on clay is nothing short of pathetic, with only one win in six tournaments. And this one win came against a 15 year old Portuguese kid with a ranking of some 1100 places below him.
On top of that, Tim played some good tennis in Rome. The only thing which may go against Tim is the psychological angle, the fact that he has beaten by Tursunov twice in as many meetings. Other than that, there is not much doubt that it will be Tim's game.