Serena Williams, Novak Djokovic head entry lists for US Open Serena Williams and Novak Djokovic head the direct entry lists for this year's U.S. Open Check out this story on USATODAY.com: http://usat.ly/2ab8Zx7 WHITE PLAINS, N.Y. - Serena Williams and Novak Djokovic head the direct entry lists for this year's U.S. Open. Williams will aim to break the record she currently shares with Steffi Graf for most Grand Slam titles in the Open era, while Djokovic will seek to reach his sixth final in the past seven years at Flushing Meadows.