Novak Djokovic says he hopes to return to action in a month's time but is "not sure" how quickly his injured hamstring will heal. Roger Federer has been among those hailing Djokovic's "incredible effort" in winning a 10th Australian Open and a record-equalling 22nd Grand Slam title on Sunday.
"Incredible effort, again! Many congratulations," the retired Federer, who won 20 majors, wrote in a brief message on Instagram.
