Why Serena Williams, Roger Federer, other tennis stars aren't playing in 2021 US Open Unknown 06:52 The U.S. Open begins Aug. 30. Some of the sport's biggest names will not be there. Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsDaniel Amokachi backs David Unsworth for Everton jobColts sense season could be teetering on trip to CincinnatiVladislav Namestnikov: We need to shore up our defenseMarkelle Fultz injury update: 76ers rookie will miss next three gamesWeek 8 Yahoo Fantasy Football: NFL DFS picks, lineup advice for cash gameESPN's Rachel Nichols confused by Hornets analyst Stephanie Ready's demotion to sideline reporter
