His great rivals now are fading away into their post-tour careers. Roger Federer has an Africa-oriented foundation and a shoe brand, among other interests. Rafael Nadal has what is said to be the best tennis academy in the world located on his native Mallorca. I have never visited, so I cannot say for a fact that it is better than the Nick Bollettieri Academy in Bradenton, Florida, which is now called IMG Academy, and anyway these things are not easily quantifiable. Hillsdale or Harvard? Bronx Science or Dalton? Ask Diane Ravitch. And Andy Murray has his own activities, notably medical philanthropy; he was a recipient of the Arthur Ashe Humanitarian Award in 2022.