(FILE PHOTO) Rafael Nadal,Grand Slam champion, will retire from tennis at the end of this season. PARIS, FRANCE - JUNE 11: Rafael Nadal of Spain waves to the crowd as he leaves the court after losing his Men's Singles Semi Final match against Novak Djokovic of Serbia on day Thirteen of the 2021 French Open at Roland Garros on June 11, 2021 in Paris, France. (Photo by Adam Pretty/Getty Images)