Tennis Men: ATP Tour 2008 Washington (usa) August 11-17: Quarterfinals: Juan Martín del Potro (arg) * - John Isner (usa) 6-4 6-4 Tommy Haas (ger) * - Alejandro Falla (col) 7-5 6-1 Igor Kunitsyn (rus) * - Somdev Devvarman (ind) 6-4 6-1 Viktor Troicki (ser) * - Andy Roddick (usa) 0-6 6-2 6-4 Semifinals: Juan Martín del Potro (arg) * - Tommy Haas (ger) 6-2 6-1 Viktor Troicki (ser) * - Igor Kunitsyn (rus) 6-4 6-2 Final: Juan Martín del Potro (arg) * - Viktor Troicki (ser) 6-3 6-3