Thanks to his amazing 2021, Novak Djokovic has closed the gap that separated him from Roger Federer and Rafael Nadal in the all-time Grand Slam ranking. The number 1 in the world won the first three majors of the season, also reaching the final at the US Open last September.Tension and fatigue prevented him from completing the work, giving due credit to a Daniil Medvedev in a state of grace. Had he triumphed in New York, the Serbian phenomenon would have become the second man in the Open Era after Rod Laver to win all four Grand Slams in the same year.The 34-year-old from Belgrade ended the season at the top of the ATP rankings for the seventh time in his car …