FedEx may get his #1 ranking back but Nadal on clay is a barrier he's unlikely to cross. I'm saying that because despite all that public misconception, he's a great clay-courter in his own right. Sadly, he keeps on running into Nadal.
"And do not curse those who call on other than GOD, lest they blaspheme and curse GOD, out of ignorance. We have adorned the works of every group in their eyes. Ultimately, they return to their Lord, then He informs them of everything they had done." (Qur'an 6:108)