Italy’s Jannik Sinner came back from two sets down to beat Russian Daniil Medvedev 3-6 3-6 6-4 6-4 6-3 in the Australian Open final on Sunday and secure his first grand slam title. Medvedev, the 2021 US Open champion, lost his previous two finals in Melbourne but the 27-year-old third seed looked to be cruising to his second grand slam triumph. But German-speaking Sinner, from the very north of Italy, roared back in his first major final having shocked Australian Open and grand slam record champion Novak Djokovic in the semi-final. The 22-year-old fourth seed had the support of the Melbourne c…