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 .
Second seed Li Na crashes out of Wimbledon . Barbora Zahlavova Strycova beats her in straight sets . Novak Djokovic survives injury scare to progress in men 's singles . Defending champion Andy Murray eases into last 16 .