Rafael Nadal, Alexandr Dolgopolov advance to Rio Open final''I'm very surprised because it's on a clay court,'' said Nara, a university student who prefers hard courts.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceRafael Nadal, Alexandr Dolgopolov advance to Rio Open final ''I'm very surprised because it's on a clay court,'' said Nara, a university student who prefers hard courts. Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Feb 23, 2014 | Modified Feb 23, 2014SI STAFFShare on FacebookShare on XHome/Tennis