Rafael Nadal defeated Daniil Medvedev in the Australian Open final and won the 21st Grand Slam of his extraordinary career. Fresh from a long stop due to injury and arrived in Australia amidst a thousand uncertainties, the Spanish phenomenon has achieved one of the most unexpected feats of the modern era.After surviving two real battles against Denis Shapovalov and Matteo Berrettini, the 35-year-old from Manacor came back two sets behind Medvedev in the final act. The Iberian managed to crack the certainties of his opponent just when the Russian seemed one step away from the finish line.By clinching his second title at Melbourn …