Serena Williams back on form at the Cincinnati Masters . World 6 beats Mikhail Youzhny of Russia in straight sets . Joined in the third round by Novak Djokovic . Mikhail Youzhny battles past Australian Andy Murray .
Andy Murray back on form at the Cincinnati Masters . World No.2 beats Mikhail Youzhny of Russia in straight sets . Joined in the third round by Novak Djokovic . Serena Williams battles past Canadian Eugenie Bouchard .