Perth : U.S. John Isner, left, and Bethanie Mattek-Sands celebrate with the Hopman Cup Trophy and Silver Diamond Studded Tennis Balls after winning the final of the mixed doubles over Belgium in the Hopman Cup tennis tournament in Perth, Australia, Saturday, Jan. 8, 2011. Mattek-Sands and Isner beat Belgium's Justine Henin and Ruben Bemelmans, 6-1, 6-3.