Spain reached their sixth Davis Cup final in 10 years after David Ferrer gave them an unassailable 3-1 semi-final lead over the United States by beating John Isner 6-7 (3/7), 6-3, 6-4, 6-2 on Sunday. Spain will travel to either Argentina or the Czech Republic for the final, depending on which of those countries prevails in the other semi-final due to be decided later on Sunday in Buenos Aires.