Roger Federer has shared an emotional letter on social media, paying tribute to his longtime rival Rafael Nadal as the Spaniard prepares to retire from professional tennis. In his heartfelt message, Federer expressed his admiration, stating, “Your old friend is always cheering for you.” Nadal is set to conclude his illustrious career at the Davis Cup finals in Malaga this week, with Spain kicking off their campaign against the Netherlands on Tuesday. The rivalry between Federer and Nadal has been a defining feature of tennis, with the two legends facing each other 40 times from 2004 to 2019, creating some of the sport's most memorable moments.