By Nick Selbe Nadal rallied from down two sets to a dramatic victory in Melbourne, notching his 21st career Grand Slam win—the most in men’s tennis history. View the original article to see embedded media. After 53 games and over five hours, Rafael Nadal has done it. The Spaniard mounted a historic rally in Sunday’s Australian Open final against Daniil Medvedev, coming back from two sets down to capture his 21st career Grand Slam title. Nadal’s victory (2–6, 6–7, 6–4, 6–4, 7–5) marked the first time in 15 years he had won a best-of-five match after dropping the first two sets, and broke a thre…