Rafael Nadal into quarterfinals in Rio without back problemsCopyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceRafael Nadal into quarterfinals in Rio without back problemsCopyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Feb 21, 2014 | Modified Feb 21, 2014SI STAFFShare on FacebookShare on XHome/Tennis
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