Jack Sock, John Isner lead USA against Nick Kyrgios, Australia in Davis Cup - USA TODAY

USA TODAY
Jack Sock, John Isner lead USA against Nick Kyrgios, Australia in Davis Cup
USA TODAY
WHITE PLAINS, N.Y. (AP) — Jack Sock, John Isner, Sam Querrey and Steve Johnson will represent the United States against host Australia in the Davis Cup quarterfinals on April 7-9. U.S. captain Jim Courier announced his roster Tuesday. Australian ...and more »