After the best possible start to the year, Novak Djokovic faces several possibilities, probabilities and some uncertainties over the next few weeks.br br The World No. 1 was on a roll, winning 15 matches in a row before losing to Daniil Medvedev in the semifinals of the Dubai Tennis Championships on Friday. The winning run included the Australian Open triumph when he tied Rafael Nadal’s record of 22 Grand Slam titles.