Roger Federer captures sixth Australian Open, Roger Federer defeated Marin Cilic in five sets to capture his sixth Australian Open championship and his 20th career Grand Slam title.SI Staff|Share on FacebookShare on XAdd us on Roger Federer defeated Marin Cilic in five sets to capture his sixth Australian Open championship and his 20th career Grand Slam title.Published Jan 28, 2018 | Modified Jan 28, 2018SI STAFFShare on FacebookShare on XHome/Tennis