Rafael Nadal was defeated by Carlos Alcaraz in the second semi-final of the ' Six Kings Slam ' in Saudi Arabia, a result that meets expectations since Rafa has not played since this summer. The last match of the Spanish legend was in fact back to the Olympics in Paris, where he played both singles and doubles with Carlitos.

"CONGRATS RAFA ON AN ICONIC CAREER," Federer wrote along with a photo of them during their playing days. For what it's worth, Roger Federer also reacted to Rafael Nadal's retirement announcement earlier in the day and sent a heartfelt message to his good friend.

Rafael Nadal, one of tennis's greatest icons, announced on Thursday that he will retire next month at age 38. The 22-time Grand Slam champion revealed the decision on social media. In the video, he states the upcoming Davis Cup finals in Malaga, Spain, will mark the end of his 23-year professional career.