FIVE OF THE BEST
16-Bernard Tomic (Aus) v John Millman (Aus) It's Bernie versus the battler in this all-Aussie affair. The winner is through to the round of 16, and a likely showdown with Andy Murray. 
32-Joao Sousa (Por) v 2-Andy Murray (GB) World No.2 Murray looked in ominous form in his second-round clash against Aussie Sam Groth and has a 6-0 record against Sousa.
14-Victoria Azarenka (Blr) v Naomi Osaka (Jpn) The rejuvenated Azarenka has cruised through her opening two matches, dropping just three games. It's hard to see her slipping up against the Japanese qualifier.
13-Milos Raonic (Can) v 21-Viktor Troicki (Srb) Both Raonic and Troicki showed strong lead-in form, winning the Brisbane and Sydney titles respectively, but they're playing for more today.
5. 15-Madison Keys (US) v 20-Ana Ivanovic Ivanovic described her third-round opponent as "very dangerous" and this looms as one of the tightest battles in the women's draw today.