2021 was a special year for Novak Djokovic, allowing him to close the gap that separated him from Roger Federer and Rafael Nadal in the all-time Grand Slam standings. The number 1 in the world won the first three majors of the season, before reaching the final also at the US Open.Stuck in tension and physically exhausted, the Serbian had to surrender to a flawless Daniil Medvedev at Arthur Ashe Stadium. The 34-year-old from Belgrade returned to the field a couple of months later in Paris-Bercy, where he posted the 37th Masters 1000 of his career.In addition, Nole ended the season at ATP number 1 for the seventh time ever (knocking out his idol Pete Sampras). The booty of Roger Federer and Rafael Nadal is decidedly thinner, both limited by a series o …