U.S. Open 2018: Novak Djokovic discusses rivalry with Roger Federer Unknown 00:49 Ahead of another likely meeting with Roger Federer, Novak Djokovic talked up their rivalry. Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsNetherlands become first to qualify for quarter-finals with win over GhanaPressure on USA and Nigeria as contenders clashAriadina earns Brazil late draw with England No surrender for Paraguay's SandovalLate header sees Korea DPR claim valuable winWATCH: Carlos Correa foul ball bounces to fiancee Daniella Rodriguez