Djokovic's injury is proving troublesome — but history showed he can never be written off

Novak Djokovic’s injured hamstring has been problematic. But, two years ago he had an Aussie Open injury, and he went on to win a record-breaking ninth title.
Novak Djokovic’s injured hamstring has been problematic. But, two years ago he had an Aussie Open injury, and he went on to win a record-breaking ninth title.