Top-seeded Rafael Nadal loses at Australian Open after an injury.
Nadal, who has won 22 Grand Slams, lost in the second round to Mackenzie McDonald, an American who has never cracked the top 40 in the world rankings.
Djokovic unsure about injury return after 22nd Tennis Grand Slam
AFP English
After his record-equalling 10th Australian Open win, Novak Djokovic says he hopes to return to action shortly but remains unsure..
