Ayumi Morita sidelined from U.S. Open with back injuryAuthor:SI StaffPublish date:Aug 25, 2013 Ayumi Morita, ranked 51st in the world, was slated to play Sara Errani in the first round.Elsa/Getty ImagesCopyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.