Federer has won both of his rubbers so far this week, dispatching Yuichi Sugita and Karen Khachanov in straight sets to confirm his status as Australian Open favourite.
And now the Swiss has the chance to send himself and doubles partner Belinda Bencic into Saturday’s final by beat Team USA in Thursday’s tie.
But the 36-year-old has refused to underestimate Sock, whose infectious smile lit up the ATP Tour when he took is first ever Masters 1000 title in Paris last year.
“I’m a big fan of his,” Federer said.
“In a match like this I think he’s going to be even more fun because it’s a bit more light-hearted.
“I think it makes him a bit more dangerous.
“The surroundings are perfect for him against me, what is there to lose?”
The pair will likely play in front of a sold-out Perth Arena crowd of nearly 14,000.
But Sock shares Federer’s confidence that the exhibition nature of the tournament, which saw the world No 2 laughing with the crowd between points on Tuesday, will help him.
“I think I play my best tennis when I’m relaxed, joking and engaging with the crowd, my girlfriend or my coach, whoever it is,” Sock said.
“I just want to have a good time out there, that’s my kind of style.”
However, Sock will hope to be swinging freely after a hip injury forced him to retire from his match against Sugita earlier this week.
The 25-year-old suffered a nasty fall during the second set and did not want to risk his place at the Australian Open, which starts on January 15, by playing on.
Veteran Australian Pat Cash replaced him in the mixed doubles but Sock has declared himself fit for today’s match against Federer.