Australian Open: Novak Djokovic on cusp of maybe his greatest achievement ever He's won 24 Grand Slams, but No. 25 would be the most satisfying — not to mention improbable — of all. Content Original Link: https://sports.yahoo.com/tennis/article/australian-open-novak-djokovic-on-cusp-of-maybe-his-greatest-achievement-ever-154457698.html