"You challenged me in ways no one else could," 20-time Grand Slam champion Roger Federer wrote as Rafael Nadal prepares to retire after Davis Cup.

Roger Federer is saying a fond farewell to Rafael Nadal. On Tuesday, Nov. 19, Federer, 42, posted an emotional tribute to his former sports rival Nadal, 38, on Instagram ahead of the tennis ace's last tournament before retiring at the 2024 Davis Cup Finals, which begins on Nov. 19.

Rafael Nadal is about to officially head into retirement after the Davis Cup, and with the possibility that we'll see him play his final match on Tuesday, his friend and rival Roger Federer penned a beautiful message to Rafa on social media.