Jack Sock is one fire in Perth at the Hopman Cup; he hasn't dropped a match in singles or doubles. On Thursday, the American also upped the hot shot ante during a 6-2, 6-2 win over Nick Kyrgios.
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 ...