An unreleased track by American DJ GoonRock helped Victoria Azarenka get back to her ruthless best at the Australian Open on Monday, the defending champion dispatching Elensa Vesnina in less than an hour to advance to the quarterfinals.

The world No 1, who was taken a full three sets by an injury-hampered Jamie Hampton in the third round, had said she needed to improve "everything" before facing Vesnina in the fourth.

Improve she did, blasting the Russian doubles specialist off the court to claim a 6-1, 6-1 victory in 56 minutes and set up a last-eight encounter against double Grand Slam winner Sveltana Kuznetsova.