The game of tennis has become a sport that is enjoyed by both young and old. Like every other sport around the world, the game of tennis is defined by its players. Players like Pete Sampras, Andre Agassi, Billy Jean King and Martina Navratilova have become staples of the sports culture, and whenever discussing all-time great athletes, each of these names need to be brought up. The current generation of players is quickly making a name for themselves as well. Roger Federer is already being talked about as the greatest ever, while Venus and Serena Williams have changed women's tennis forever. It's these stars that draw fans to buy tickets to tennis tournaments every year.