Novak Djokovic has been on tour for more ... So it’s no surprise some fans have started to wonder when he will hang up his racket. But Djokovic has now thrown a curveball in the retirement ...

"Maybe it’s time for Novak Djokovic to hang up his racket and let the next generation take over," one fan wrote. "Djokovic needs to hang it up... He’s just hanging on trying to be relevant ...