A "rusty" Novak Djokovic says his straight-sets thumping of China's Zhang Zhizhen was as good as it gets for an opening match of the summer, and he expects to be even better by the time the Australian Open rolls around.
Djokovic crushed Zhang 6-3 6-2 in 72 minutes on Sunday night to give Serbia a 1-0 lead in their United Cup tie against China in Perth.
