Monica Seles is a former world No. 1 tennis player who represented Yugoslavia and the United States. She won nine major singles titles, eight of them as a teenager while representing Yugoslavia, and the final one while representing the United States.

Tennis is a racket sport that is played either individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to manoeuvre the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball validly will not gain a point, while the opposite player will.