Serena Williams walks on stage at the ESPY Awards in Los Angeles

© 2013 United Press International, Inc. All Rights Reserved. UPI.com contains copyrighted material, trademarks and other proprietary information of United Press International, Inc. ("UPI") and its third-party licensors, including, but not limited to, text, photos, videos, and graphics. Visitors to UPI.com may use this Web site solely for their own personal and non-commercial use. Any reproduction, republication and/or redistribution of any content on the Web site is expressly prohibited without the prior written consent of UPI or its applicable third-party licensors. UPI and United Press International are registered trademarks in the United States and in other countries.