Mike Bryan, foreground, and Bob Bryan, of the United States, practice Thursday, Jan. 31, 2013, in Jacksonville, Fla., for this weekend's Davis Cup tennis match between Brazil and the United States. (AP Photo/The Florida Times-Union, Bob Mack)

Photo by: Bob Mack

Mike Bryan, foreground, and Bob Bryan, of the United States, practice Thursday, Jan. 31, 2013, in Jacksonville, Fla., for this weekend's Davis Cup tennis match between Brazil and the United States. (AP Photo/The Florida Times-Union, Bob Mack)