Federer will likely have to win to get out of the group after losing his opening round robin match to Kei Nishikori.
The Swiss star kept his semi-final hopes alive by beating Dominic Thiem in straight sets in his second group match.
Federer was supposed to practice at Queen’s in west London ahead of his showdown with Thiem but instead took the day off to refresh his mind.
And because the tactic worked he has decided to follow the same routine in the hope of beating in-form Anderson later this week.
“I will do the same again tomorrow because it worked,” Federer said.
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“Important was not about my forehand or my backhand or my serve or anything. I guess it was my head. For that sometimes you need a break.
“I’ve been playing a lot of tennis the last two months.
“That’s why yesterday – sorry, I saw the Nishikori match on the way back to the hotel. A good, long trip. That was positive. Had a lot of time to talk.
“We came to the conclusions, or the coaches thought, take it easy, enjoy the day with your family, and come out happy on I don’t even know what day of the week it is today.
“Again, when you play Thiem, that’s what we care about, the head, not the shots.
“The shots are there. I felt that way today.
“So I’m very happy that that was the right decision and I was able to show a reaction from my first-round match.”
Anderson was in top form in his second round robin as he thrashed Nishikori 6-0, 6-1.
And Federer is wary about the dangers the South African possesses.
“He has been playing great. He has had a wonderful season,” Federer added.
“Played great against me as well at Wimbledon. Today he had obviously a good game for him.
“So that’s my focus. I can’t talk about what would come next because it’s a hard match in itself.
“My first-round match here wasn’t great, so today was better, and I need to keep that up against Kevin, obviously, if I want to have a chance to stay here in London.”