Novak Djokovic and Aryna Sabalenka, the defending men’s and women’s singles champions, will be in action at Melbourne Park on the opening day as the 2024 Australian Open is all set to kick off on Sunday. Serbia's Novak Djokovic and Aryna Sabalenka of Belarus react during an exhibition match against Stefanos Tsitsipas of Greece and compatriot Maria Sakkari ahead of …