[dropcap]R[/dropcap]oger Federer powered home to beat Marin Cilic in five sets to win his sixth Australian Open and 20th Grand Slam title in a riveting final on Sunday. The Swiss defending champion dropped his only sets of the tournament before completing a 6-2, 6-7 (5/7), 6-3, 3-6, 6-1 win over the sixth seeded Croatian