Federer had already ruthlessly claimed the first set 6-1 and was cruising 5-2 in the second set, when the Korean made a decision to opt out of the game.
But the bespectacled 21-year-old, nicknamed "the professor", simply had no answer to Federer's firepower.
Federer will be the oldest finalist at a Grand Slam event since 39-year-old Ken Rosewall was runner-up at the 1974 US Open, while his seventh Australian Open final will be an open era record for the event.
But Cilic's only victory came in a hard-court Grand Slam tournament, when he swept Federer in straight sets in the 2014 U.S. Open final on his way to his lone Grand Slam title.More news: How 50 Cent Accidentally Became a Bitcoin millionaire
'We saw it against Rafa, we saw it last night again against Edmund, he brings the power, he brings basically everything, ' he said after beating Chung.
A blistered left foot cut short his semi-final against Roger Federer but Hyeon Chung has won the Swiss maestro's admiration after a stellar Australian Open campaign.
"We will see a fresh and ready Marin this time around. I could tell something was wrong before he took the injury timeout", Federer said. "I think the belief and the way he played very positive made him win that match because he didn't look good there for a while when he was down a set and a break and everything". I really good experience in last two weeks. Because he [Chung] has played so many matches in the row, I think that's why it was a build-up.
Making matters worse is the broadcaster robbed fans of roughly two-to-three games in a second set that only lasted a total of seven games before Chung was forced to retire. I hope I can mix up my game.
It was left to Chung's agent Stuart Duguid to explain his client's ailment as "blister under blister under blister". He upset No. 4-seed Alexander Zverev and six-time champion Novak Djokovic en route to becoming the first Korean tennis player, male or female, to reach the semifinals of a major. "But things must be all right if I'm in this stage right now not having dropped a set and in the finals".More news: WWE's Vince McMahon announces return of XFL football league
"I've played with blisters in the past, and it hurts a lot.at some point, it is just too much", Federer said.
World number two Federer now turns his attention to Cilic, who he has only lost to once in nine meetings.
Considered one of his biggest strengths, Cilic needs to make a high percentage of first serves to have any chance.
With the defending champion having shown mere fleeting signs of nerves throughout the fortnight, Federer blasted his way to a 4-1 advantage in the opener.
"I've played a great tournament so far, I'm playing much more aggressive, hitting most of the shots really good".More news: Flu Can Significantly Increase Your Risk of a Heart Attack
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