SYDNEY, Dec. 31 (Xinhua) -- Novak Djokovic and Aryna Sabalenka opened their Australian Open campaigns with straight sets victories at the Brisbane International tennis tournament on Tuesday.
Djokovic beat Australian world number 73 Rinky Hijikata 6-3, 6-3 in one hour and 14 minutes on center court.
The Serbian 10-time Australian Open champion lost only 10 points on his serve and never gave Hijikata a brea
