The athlete is playing tennis on a hard court, holding a racket and preparing to hit the ball.  
The child is playing tennis on a grass court, holding a racket and preparing to hit the ball.  
The professional is playing tennis on an indoor court, holding a racket and preparing to hit the ball.  
The player is playing tennis on a red clay court, holding a racket and preparing to hit the ball.  
The beginner is playing tennis on a synthetic court, holding a racket and preparing to hit the ball.