Australia's Nick Kyrgios, left, talks with Serbia's Novak Djokovic during their doubles match against Alexander Erler of Austria and Andreas Mies of Germany in the Brisbane International, at the Queensland Tennis Centre in Brisbane, Australia.

Australia's Nick Kyrgios, left, and Serbia's Novak Djokovic celebrate during their doubles match against Alexander Erler of Austria and Andreas Mies of Germany in the Brisbane International, at the Queensland Tennis Centre in Brisbane, Australia.

Novak Djokovic of Serbia plays a shot during his Brisbane International Second Round match against Rinky Hijikata of Australia at Queensland Tennis Centre in Brisbane.

Novak Djokovic of Serbia plays a shot during his Brisbane International second round match against Rinky Hijikata of Australia at Queensland Tennis Centre in Brisbane.

Novak Djokovic of Serbia and Nick Kyrgios of Australia react during their doubles match against Serbia's Nikola Mektic and Michael Venus of New Zealand at the Brisbane International in Brisbane, Australia.

Australia's Nick Kyrgios, left, and Serbia's Novak Djokovic in action during their doubles match against Alexander Erler of Austria and Andreas Mies of Germany in the Brisbane International, at the Queensland Tennis Centre in Brisbane, Australia.