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 maiden grand slam title. It is the first men’s major title for an Italian since Adriano Panatta won the French Open in 1976. “It is a huge tournament for me. The support has been crazy the whole two weeks,” Sinner said courtside. “Every match I find something I can improve and you (Medvedev) make me a much, much better player.” Medvedev, the 2021 US Open champion, lost his previous two finals in Melbourne yet the 27-year-old third seed loo…