On Sunday, Novak Djokovic made history by winning Cincinnati to have won all of the ATP 1000 tournaments in his career. Since the establishment of the ATP Masters series in 1990, no player had won all of the Masters titles, let alone also winning the ATP Tour Finals, Davis Cup and every Grand Slam.
Currently, the Masters tournaments are Indian Wells, Miami, Canada, Cincinnati, Madrid, Monte-Carlo, Rome, Paris, and Shanghai.
It's hard to believe that no other member of the Big Four—meaning Andy Murray, Rafael Nadal and Roger Federer—has accomplished the same feat. So, out of the nine Masters tournaments, what are they missing?