The defending champion took just 91 minutes to beat Bernard Tomic 6 - 3 , 6 - 3 , 6 - 3 .
The defending champion will face world number 14 Kevin Anderson in the fourth round .
The defending champion took just 91 minutes to beat Bernard Tomic 6 - 3 , 6 - 3 , 6 - 3 and will face world number 14 Kevin Anderson in the fourth round .