Jack Sock and Ryan Harrison rallied from a set down in a tight doubles rubber to ensure the United States became the first team to advance to the Davis Cup semi-finals on Saturday with a 3-0 victory over Belgium in Nashville, Tennessee.
Sock and Harrison failed to break serve until the fourth set yet managed to see off doubles specialists Sander Gille and Joran Vliegen 5-7 7-6(1) 7-6(3) 6-4 to wrap up the tie in the fewest possible matches for the Americans.
The U.S. duo overcame some nervous moments but were able to win key points in the two tiebreakers to secure a victory to ensure the record 32-times winners advanced to the last four.
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