Rebecca Rubin Film and Media Reporter Bradley Cooper flexed a new skill on Saturday as the actor-turned-director interviewed tennis legends Serena and Venus Williams for the A+E Networks and the History Channel’s History Talks in Washington D.C. At the top of the conversation, he addressed Serena’s recent announcement that she was retiring from tennis. She played her final match at the U.S. Open last month in New York City. “I just needed to stop,” Serena recalled. “I always said I wanted to stop when I’m playing really good tennis and winning and beating good players. For me, it’s really about things I want to do spiritually and spending time with my daughter and family.”