Rafael Nadal into quarterfinals of Australian Open . Federer wins first title since Wimbledon final in Melbourne last year. Nick Krygios wins five-set thriller against Andreas Seppi . Second seed Sharapova was rarely troubled in dispatching 21st seed Peng Shuai of China , 6-3 6-0 , while Canadian Bouchard struggled to defeat Irina-Camelia Begu of Romania 6-1 5-7 6-2 . Australian hope will play Andy Murray in the last eight .
Rafael Nadal into quarterfinals of Australian Open . Federer wins first title since Wimbledon final in Melbourne last year. Nick Krygios wins five-set thriller against Andreas Seppi . Australian hope will play Andy Murray in the last eight .