Djokovic vs Federer SET3 6-4 Tennis & highlights AO 2016 HD1080 ROGER Federer knows he must strike a balance between daring and reckless as he strives to break Novak Djokovic’s grand slam stranglehold in Thursday night’s blockbuster Australian Open semi-final in Melbourne. Federer and Djokovic will resume the most enduring rivalry in men’s grand slam history when they clash for a 15th time at a major — and 45th time overall in an epic series stretching almost a decade.