Nicolas Kiefer of Germany beat Juan Ignacio Chela of Argentina , 7-6 ( 4 ) , 6-3 , 6-3 , and Nikolay Davydenko of Russia defeated the 12th-seeded Dominik Hrbaty of Slovakia , 4-6 , 4-6 , 6-4 , 6-2 , 6-3 , after being down two sets and a break .