The one between Roger Federer and Novak Djokovic is a total challenge. To chase Rafael Nadal’s 21 Slams (possible for the Serb, utopia for the Swiss, the last probably in his last tennis career season). But also for other records and goals. Djokovic starts with an advantage: age. What can stop it? Tournament restrictions caused by the pandemic, like everything that happened on the eve of the Australian Open. But now the Serb is playing in Dubai, where there is a record that belongs to Roger. Novak Djokovic talked about the difficulty of breaking Roger Federer’s record of 8 wins at the Emirates tournament. The world number one is currently stuck at 5 titles and this week he will have the chance to close the gap by competing for the sixth triumph.Djokovic will make his debut in a few hours against the 19 …