BIRMINGHAM, Ala. — Jack Sock and Steve Johnson won their doubles match in three sets Saturday, sending the United States to the Davis Cup quarterfinals with a 3-0 victory over Switzerland. Sock and Johnson, bronze medalists in men’s doubles at the Rio Olympics, beat Henri Laaksonen and Adrien Bossel 7-6 (3), 6-3, 7-6 (5). Switzerland
