An emotional Roger Federer of Team Europe sits alongside his playing partner Rafael Nadal after their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
Team Europe's Roger Federer of Switzerland, waves during the opening ceremony of the Laver Cup tennis tournament at the O2 in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
Team Europe's Roger Federer, front left, and Rafael Nadal react during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
Team Europe's Roger Federer playing with Rafael Nadal makes a return during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
Team Europe's Roger Federer, front right, and Rafael Nadal chat during a change of ends break during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
Team Europe's Roger Federer, left, and Rafael Nadal during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
Team Europe's Roger Federer, left, and Rafael Nadal during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
An emotional Roger Federer of Team Europe embraces his wife Mirka and their children after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
An emotional Roger Federer of Team Europe acknowledges the crowd after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
An emotional Roger Federer of Team Europe is interviewed after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
Team Europe's Novak Djokovic stands behind an emotional Roger Federer after Federer played with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
Team Europe's Roger Federer is lifted by fellow players after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
An emotional Roger Federer of Team Europe acknowledges the crowd after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)
Team Europe's Roger Federer, ducks under a ball, as he plays with Rafael Nadal during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. (AP Photo/Kin Cheung)
An emotional Roger Federer of Team Europe acknowledges the crowd after playing with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)