This is his 18th Grand Slam title and first for five years.
Roger Federer, 35, won 6-4 3-6 6-1 3-6 6-3 to claim his fifth Australian Open title and extend his lead at the top of the all-time men’s major winners’ list.
Rafael Nadal, 30, remains tied in second with Pete Sampras on 14 Grand Slams following his first final since 2014.
Roger Federer’s previous major title came at Wimbledon in 2012.
The Swiss said: “I’ve been coming here for almost 20 years now.
“I’ve always enjoyed it and now my family does too.
“Thanks again for everything, to everybody. I hope to see you next year. If not, this was a wonderful run here and I can’t be more happy to win.”
Roger Federer’s achievement in ending his drought is all the more remarkable given this was his first tournament since last year’s Wimbledon, after which he took the second half of the season off to recover from a knee injury.
He becomes the first man in history to win five or more titles at three different Grand Slam events – five Australian Opens, five US Opens and seven Wimbledons.
Rafael Nadal was also on the way back from injuries that curtailed his 2016 season, but the Spaniard could not improve his winning record against Roger Federer – the Swiss has now won 12 of their 35 matches and three of nine major finals.
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