Nadal beats Wawrinka, clinches year-end No. 1 rank at ATP FinalsCopyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.SI Staff|Nadal beats Wawrinka, clinches year-end No. 1 rank at ATP FinalsShare on FacebookShare on XAdd us on Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.Published Nov 6, 2013SI STAFFShare on FacebookShare on XHome/Tennis