I believe that Dolgo "The Dog" polov will be a massive threat on clay.
RAFAEL NADAL PARERA
2007|David Nalbandian strikes lucky to win against Rafael Nadal 6-4 6-0
2008|Mikhail Youzhny escapes Rafael Nadal 6-1 6-0
2008|Jo-Wilfried Tsonga was pushed to the edge by Rafael Nadal 6-2 6-3 6-2
2009|Juan Martin Del Potro survives Rafael Nadal 6-2 6-2 6-2