There are several types of “Out-of-Game Activities” by the hero & team.
Fed Cup & other national team competitions;
Charity matches & tournaments;
Any tournament prizes (beyond prize money) received in-kind – jewelry, fine arts, gadgets, etc.
Advertising & endorsement deals, media appearances:
Proceeds from non-tennis media activities (like reality shows, movies, etc.);
Proceeds from books, scenarios, movie rights;
Technical partnerships with supply received in-kind (rackets, strings, etc.);
Proceeds received from personal business projects, investments & activities non-related to the game.