By Ighodalo Emiator: Harry Potter author and social media dynamo J.K. Rowling crafted the perfect response to a tweet that took a cheap shot at tennis champ Serena Williams on Saturday. Rob @diegtristan8  · Jul 11, 2015 Replying to @jk_rowling @jk_rowling @hansmollman ironic then that main reason for her success is that she is built like a man J.K. Rowling   @jk_rowling .@diegtristan8 …