Even though Federer opted to skip the team competition, Federer was watching on attentively to assess the form of his biggest rivals.
From his defeat by Rafael Nadal in the 2008 Wimbledon final to his agonizing loss from double match point against Novak Djokovic at Wimbledon last summer, there are some losses that stick in the mind.
Next up for Federer, who was broken only once in the match, is Australian world No 47 John Millman, who upset him in the fourth round of the US Open in 2018.
"I don't know anything remotely close", Federer recalled at Melbourne Park on Wednesday. I just want to congratulate you on all the things you achieved and at the same time to be nice to everyone. I never had that.
On that occasion Federer had one of those blue moon type matches where his most effective attacking weapon went missing. Like anyone under pressure, there's your forehand or there's your entire game where you're feeling uncomfortable with things.
On Friday night, Roger Federer and John Millman will step on the Rod Laver Arena in the Australian Open third-round clash.
Roger never liked the conditions at the US Open two years ago, struggling like nearly never before on a humid NY night after hitting ten double faults and failing to make an impression at the net where he usually rules.
The latter comment was said with a big smile on his face.
Defending champion Djokovic could well be waiting for Federer in that potential semi-final slot and the Serbian is a strong favourite to win again in Melbourne.
"Both guys are already showing great signs", he said.
"I'm very happy, it's a great start to the season", Federer said, via The Guardian.
I'd played him at the US Open in 2014 - the first time I'd ever gotten to a main draw off my own ranking.
"He knows Margaret Court Arena better [and] Melbourne Arena, but I didn't think about it".
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"Look, I have no regrets".
Reflecting on the US Open setback, Federer said he suffered on an unprecedented scale.
"It was a good match for me", Williams said, via the Australian Open.
"Just was something that is hopefully history of just one day". I was lucky enough you could hit up there - but you can't do that at Wimbledon. I tried to figure it out as long as I could.
"I nearly passed out when I played out against him in NY". It just shows the level competition Federer will have to deal with. He is now ranked third while his opponent comes in at position 47 in the ATP world rankings. Riding a wave of local support, the 47th-ranked Millman has seen off Ugo Humbert and 31st seed Hubert Hurkacz en route to his first third-round appearance at the Australian Open since 2016. Having dropped only one set in two rounds and spending less than six hours on court, he should be ready to give everything against the man he calls "a class act". "That was one of those really special nights at Arthur Ashe, packed crowd there".
"He learned that he could stay on the same court as arguably the best player of all time", Groth told Wide World of Sports. But the Australian will give it his all.
"[But] I'll go out there and leave it all out there". I prefer the slightly heavier conditions like you have up in Brisbane. You start off regardless of who you play, it's 0-0. "Home Slam against someone like Roger, it's pretty cool".
Millman had previously asked to be scheduled to play on Melbourne Arena because it is a rowdier stadium where spectators can enter the venue with a standard ground-pass ticket.
Millman, who admitted organisers would nearly certainly not take his request seriously, said he felt courts other than Rod Laver had better crowd support for him.
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"But I do know that that doesn't really count for anything now".
"I've got to try to keep as good a quality as possible because we know that Roger transitions so well, he jumps on anything short". But I haven't thought of it.
"I'm ready to go anywhere, whatever it takes".