Having already confirmed their progress to the semis on Saturday, the third day's play at the Curb Event Center on Sunday was a mere formality, with the US resting John Isner in favour of Ryan Harrison, reports Efe.
Harrison, who had won his doubles match partnering Jack Sock, defeated Belgium's Ruben Bemelmans 6-3, 6-4 in an hour and five minutes on Sunday.
In the semi-finals, scheduled to be played between September 14-16, US will face Croatia, who eliminated Kazakhstan 3-1.
The US has the most number of Davis Cup titles with 32, ahead of Australia, Spain, France and Great Britain, but has not won the competition since 2007.
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