Roger Federer announces retirement

Roger Federer, of Switzerland, poses with the championship trophy after defeating Lleyton Hewitt, of Australia, in the men's singles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 12, 2004. (AP Photo/Richard Drew, File)

Roger Federer of Switzerland kisses his trophy after winning the mens final against Andre Agassi of the United States, at the US Open tennis tournament in New York, Sunday, Sept. 11, 2005. Federer won 6-3, 2-6, 7-6 (1), 6-1. (AP Photo/Amy Sancetta, File)

Switzerland's Roger Federer serves to Richard Gasquet of France during the men's singles second round match on day four of the Wimbledon Tennis Championships in London, Thursday July 1, 2021. (AP Photo/Alberto Pezzali, File)

Switzerland's Roger Federer plays a return to Britain's Cameron Norrie during the men's singles third round match on day six of the Wimbledon Tennis Championships in London, Saturday July 3, 2021. (AP Photo/Alastair Grant, File)

Roger Federer holds the winners trophy after his 6-0, 7-6, 6-7, 6-3 victory over Spain's Rafael Nadal in the Men's Singles final on the Centre Court at Wimbledon, Sunday July 9, 2006. (AP Photo/Anja Niedringhaus, File)

Switzerland's Roger Federer waves while he does a lap of honor with his trophy after defeating Spain's Rafael Nadal in the men's singles final at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 29, 2017 (AP Photo/Aaron Favila, File)

Defending champion Roger Federer, right, holds the winners trophy with runner up Rafael Nadal of Spain after the Men's Singles final on the Centre Court at Wimbledon, Sunday July 9, 2006. (AP Photo/Anja Niedringhaus, File)

Roger Federer of Switzerland holds up the winners trophy after he defeated Jo-Wilfried Tsonga of France in thier singles final tennis match at the ATP World Tour Finals, in the O2 arena in London, Sunday, Nov. 27, 2011. (AP Photo/Kirsty Wigglesworth, File)