The Laver Cup organisers confirmed on Thursday that Roger Federer will play his final match alongside longtime adversary Rafael Nadal.
On Friday at the O2 arena in London, the Spaniard, who has won 22 majors, and the 20-time Grand Slam winner will play doubles.
Federer has been dealing with a knee issue and will not play singles in London. His most recent competitive match was a loss to Hubert Hurkacz in the Wimbledon quarterfinals of last year.
Team Europe and Team World compete against one another in the Laver Cup.
Bjorn Borg leads the six-member European team, which also features 21-time major champion Novak Djokovic and three-time major champion Andy Murray.
Their opponents, Team World, skippered by John McEnroe, include Taylor Fritz, Felix Auger-Aliassime and Diego Schwartzman.
Federer, 41, announced last week he intended to retire after the three-day Laver Cup.
He said on Wednesday that finishing his career by teaming up with Nadal would be his dream scenario.
Federer said he and Nadal, 36, had always maintained respect for each other even as they vied for the biggest trophies in the sport.
“For us as well to go through a career that we both have had and to come out on the other side and being able to have a nice relationship I think is maybe a great message as well to not just tennis but sports and maybe even beyond,” he said.
Italian Matteo Berrettini, the first alternate for Europe, will take Federer’s place over the weekend.