second seed Li Na crashes out of Andy Murray . Djokovic faces a tough last 16 clash against Jo-Wilfried Tsonga , but has won 10 of his 11 meetings with the Frenchman , who is seeded 14th this year . Andy Murray beats her in straight sets . Novak Djokovic survives injury scare to progress in men 's singles . Defending champion Li Na eases into January .
second seed Li Na crashes out of Andy Murray . Andy Murray beats her in straight sets . Novak Djokovic survives injury scare to progress in men 's singles . Defending champion Li Na eases into January .