(Reuters) – World number ones Novak Djokovic and Serena Williams take center stage at the U.S. Open on Thursday, headlining a juicy day of action at the year’s final grand slam. Always a crowd favorite at Flushing Meadows, Williams will have to share some of cheers as she goes against fellow American Vania King in a second round matchup. Williams may be a big fan of the next generation of American players but for the […]