The link below is to a must read article about Serena: "The widespread impact of Serena Williams aura..." by John Werthiem.
The paragraph I love: "But no one here has as much aura as Serena WIlliams. Her face is on every conceivable piece of promotional material. The video feed in the players' lounge shows her arrival at the complex each morning. Her entourage - her agent, coach, her trainer, her hitting partners -- are better known and better recognized than most players in the draw. When she walks the halls, guards look up, hoping their eye contact is reciproacted. Her name is the first line of the draw."
I have to say that I have seen Serena play in Washington, DC, (team tennis), Paris (RG) and Miami. And I have seen a lot of the other big names. But there is something incredible in the air when Serena walks on to the court. And when she is up to serve, and she clocks that aces the reaction is priceless. It is as if everyone in the stadium turns to the person next to them to say: WOW! did you see that.
http://sportsillustrated.cnn.com/tennis/news/20140115/serena-williams-australian-open-mailbag/index.html