John Isner, Jack Sock, Steve Johnson and Sam Querrey have been named in the US Davis Cup roster that will face a Switzerland team missing Roger Federer or Stan Wawrinka next month.
The Switzerland-US winner will face Australia or the Czech Republic in the Davis Cup quarter-finals in April.
The US will be without the Bryan brothers, who announced recently they were retiring from Davis Cup competition.
The best-of-five series in the first round will be played on an indoor hard court February 3-5 in Birmingham, Alabama.
Rosters were announced Tuesday, and Switzerland's team will be Marco Chiudinelli, Henri Laaksonen, Adrien Bossel and Antione Bellier.
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Federer, a 17-time grand slam champion, and Wawrinka, winner of three major titles, will face off in the Australian Open semi-finals this week.
