The world Maria Sharapova suffers shock defeat at the Australian Open . The Russian was beaten in straight sets by American Sloane Stephens on Centre Court after a topsy-turvy final that saw her serve out three match points and then lose two of them to be broken twice before finally World No . 1 Rafael Nadal into the quarterfinals after beating Japan 's Kei Nishikori . Fourth seed Andy Murray also into the last eight with a win over Stephane Robert .
Maria Sharapova suffers shock defeat at the Australian Open . The Russian was beaten in straight sets by American Sloane Stephens on Centre Court after a topsy-turvy final that saw her serve out three match points and then lose two of them to be broken twice before finally World No . 1 Rafael Nadal into the quarterfinals after beating Japan 's Kei Nishikori . Fourth seed Andy Murray also into the last eight with a win over Stephane Robert .