The mind of Sloane Stephens pinballs. Its attentions can ricochet from an e-mail to a Gchat to a random news story in the space of a moment--as fast as she runs down shots on the court. America's next great tennis hope--ranked 17th in the world--calls her bejeweled smartphone her "lifeline," "friend" and "boyfriend, if I need it to be." Before a sushi lunch in a Carson, Calif., strip mall, she makes a call, orders, then heads back outside to make another call. She has yet to return serve on 253 unread text messages. Stephens, who turned 20 in March, could be...
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