DAVIS CUP: U.S. CLINCHES QUARTERFINAL BERTH Sock and Johnson defeat Switzerland In World Group First Round Tie     By Junior Williams   (February 4, 2017) BIRMINGHAM, Alabama - For the clincher, United States Davis Cup Captain Jim Courier called on the 2016 Olympic bronze medal doubles team. Jack Sock and Steve Johnson delivered for the … [Read more...] about Davis Cup: U.S. Clinches Quarterfinal Berth; Sock and Johnson defeat Switzerland In World Group First Round Tie