Roger Federer wins opener at U.S. Open . Five-time champion beats Slovenian Grega Zemlja . Federer lowly seventh seed after indifferent 2013 . TL;DR Rafael Nadal and Andy Murray both advance to semifinals of Australian Open, while defending champions Djokovic and Serena Williams are eliminated in first round.
Roger Federer wins opener at U.S. Open . Five-time champion beats Slovenian Grega Zemlja . Federer lowly seventh seed after indifferent 2013 . Caroline Wozniacki and Petra Kvitova come through testing matches .