By Steve Keating NEW YORK, Aug 27 (Reuters) - World number ones Novak Djokovic and Serena Williams take centre stage at the U.S. Always a crowd favourite 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 second successive match the 17-time grand slam winner will do her best to usher another compatriot to the exit having dismissed Taylor Townsend in the opening round. "I'm not sure if I played her (King) before but I've always liked her game," said Williams, who will also join big sister Venus in the doubles on Thursday. Click here to read full news..