Well, no one opened this yet and it is a fairly big tournament. Nadal is playing this time, so no vulturing Ferrer
Ferrer played a very good final, but lost both sets in the final games. IIRC he was leading at least the 1st set with a break. If only he'd have more mental strenght, he could definitely beat current Rafa by playing his best tennis.
This year he seems to have quite an easy draw to semis, and Almagro is a potential SF opponent. Hopefully Almagro doesn't at least lose it after serving for the match like at AO.
Rafa has some potentially tricky matches. It's gonna be interesting to see Nishikori's clay form, he'd face Rafa in QF. And Dimitrov is Rafa's potential SF opponent but he's in the same section with dangerous Gulbis and Berdych. And of course, the biggest challenge is already on R2, the almighty Warlocq.
So, there are some players who could outplay current Rafa, and Rafa seems mantally fragile right now. But still, only Djokovic and Zeballos have had the mental capacity to beat Rafa this year.