John McEnroe's side entered the final day of the three-day event in London trailing four-time champions Team Europe 4-8.
Roger's career has been a rollercoaster of a ride. He has been at the pinnacle of success and also experienced many downfalls that tested his resilience and determination to get back up.
The tennis legend said that the last 24 years on tour have been an incredible adventure for him.
With recovery underway, Federer expects himself to return to full fitness before the 2021 season.
The two greats of their respective sports have earlier also engaged in friendly banters on Twitter and have gone on record multiple times sharing a mutual respect for one another.
"I think Novak out of the top three is pushing the agenda to give money to the lower ranks hardest."
The renewed calendar for the resumption of the tour after it was halted due to the coronavirus pandemic in early March was announced by the ATP on June 17.
Earlier, Roger Federer had skipped the entire second half of 2016 due to injury before returning to win the Australian Open and Wimbledon in 2017.