Roger Federer wins, setting up ATP Finals matchup against Novak DjokovicFederer battled back from a set down against Stan Wawrinka and saved four match points in the third set to make his ninth final.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceFederer battled back from a set down against Stan Wawrinka and saved four match points in the third set to make his ninth final.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Nov 16, 2014 | Modified Nov 16, 2014SI STAFFShare on FacebookShare on XHome/Tennis