The Bryan brothers delivered as expected Saturday.
That just leaves John Isner to perform the unexpected Sunday against defending champion Spain for the United States to reach the Davis Cup final.
Mike and Bob Bryan won their doubles match against Marcel Granollers and Marc Lopez, 6-3, 3-6, 7-5, 7-5, to cut Spain’s semifinal lead to 2-1 in Gijon, Spain.
On Sunday, Isner will face David Ferrer, who is 15-0 on clay in Davis Cup competition. Isner lost a five-set match Friday to Nicolas Almagro.
Should Isner win, teammate Sam Querrey will play Almagro — who is 8-1 on the surface — for a spot in the final in November. The winner faces either Argentina or the Czech Republic.
Spain is aiming for a fourth trip to the final in five years, having won all previous 37 World Group series when they have swept the opening singles.
In Buenos Aries, Argentina lost in doubles Saturday — falling behind, 2-1, to the Czech Republic — and also lost Juan Martin Del Potro for Sunday’s deciding singles.
Del Potro defeated Radek Stepanek Friday with an inflamed left wrist. He said afterward he was in pain and playing with half of his arsenal of shots. Argentina captain Martin Jaite said Del Potro will be replaced by Carlos Berlocq, who will face Tomas Berdych in first reverse singles.