MELBOURNE, Australia—He lost the first two sets, was low on confidence and was one point from a quarterfinal exit at the Australian Open, so Daniil Medvedev asked himself the question: What would Novak do? Fair question. Top-ranked Novak Djokovic is a nine-time Australian Open champion who finished one win short of a calendar-year Grand Slam in 2021. Modelling himself after the 20-time Grand Slam champion, Medvedev told himself late Wednesday to make Felix Auger-Aliassime fight for every point. More than one hour after saving a match point on his serve in the fourth set, the U.S. Open champion finished off a 6–7 (4), 3–6, 7–6 (2), 7–5, 6–4 comeback victory almost a half-hour after midnight. “He was playing insane, like better than I have ever seen him play. It was unreal,” Medvedev said. “So third set I had zero confidence in myself and in the outcome of the match.” Medvedev …