MELBOURNE, April 7 (Reuters) - Jordan Thompson fed off a rowdy home crowd to upset Jack Sock 6-3 3-6 7-6(4) 6-4 for the biggest win of his career and give Australia a 1-0 lead over the United States in their Davis Cup quarter-final in Brisbane on Friday.
The 79th-ranked Thompson clubbed 14 aces and 17 winners as he ground down the American world number 15 in just over three hours at Pat Rafter Arena.
Wayward Sock, who sprayed 66 unforced errors, hammered a forehand wide of the line to give up match point and surrendered the contest with a backhand over the baseline.
Australian number one Nick Kyrgios plays John Isner in the second singles rubber later on Friday. (Reporting by Ian Ransom; Editing by Nick Mulvenney)