Melbourne: Swiss great Roger Federer and defending champion Novak Djokovic could square off in the semi-finals of the Australian Open, the draw released for the season’s first Grand Slam has revealed. Meanwhile, possible threats to world No. 1 Rafael Nadal in the top half of the men’s singles draw include local favourite Nick Kyrgios, fifth-ranked Austrian Dominic Thiem and fourth-ranked Russian Daniil Medvedev, reports Efe news. But the third-ranked Federer’s road to the final-four stage at this year’s event, which will run from January 20 to February 2, appears easier on paper. He will take on 81st-ranked American Steve Johnson in the first round and could play 41st-ranked Serbian Filip Krajinovic in the second round. If he gets past his opening matches, the Swiss may need to exact revenge on Australian world No. 47 John Millman and/or Bulgarian world No. 19 Grigor Dmitrov, who pulled off big upsets to oust Federer from the 2018 and 2019 US Opens, respectively, but would not be favored to repeat those feats. Two other players in Federer’s quarter who could be problematic are in-form Canadian Denis Shapovalov, the world No. 13, and Italian world No. 8 Matteo Berrettini, while another intriguing talent in that…