United States' John Isner returns a shot from Brazil's Thiago Alves during a first-round Davis Cup tennis match, Friday, Feb. 1, 2013, in Jacksonville, Fla. Isner won 6-3, 7-6 (4), 6-3. (AP Photo/Florida Times-Union, Will Dickey)

Photo by: Will Dickey

United States' John Isner returns a shot from Brazil's Thiago Alves during a first-round Davis Cup tennis match, Friday, Feb. 1, 2013, in Jacksonville, Fla. Isner won 6-3, 7-6 (4), 6-3. (AP Photo/Florida Times-Union, Will Dickey)