Davis Cup

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Switzerland's Adrien Bossel returns the ball to United States' Sam Querrey during a Davis Cup tennis match, Sunday, Feb. 5, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Henri Laaksonen returns the ball to United States' Jack Sock and Steve Johnson during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Sam Querrey returns the ball to Switzerland's Adrien Bossel during a Davis Cup tennis match, Sunday, Feb. 5, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Adrien Bossel returns the ball to United States' Sam Querrey during a Davis Cup tennis match, Sunday, Feb. 5, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Sam Querrey throws up ball to serve to Switzerland's Adrien Bossel during a Davis Cup tennis match, Sunday, Feb. 5, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Steve Johnson returns the ball to Switzerland's Henri Laaksonen and Adrien Bossel during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Jack Sock returns the ball to Switzerland's Henri Laaksonen and Adrien Bossel during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Adrien Bossel returns the ball to United States' Jack Sock and Steve Johnson during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Henri Laaksonen serves to United States' Steve Johnson and Jack Sock during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Steve Johnson returns the ball to Switzerland's Henri Laaksonen and Adrien Bossel during a Davis Cup tennis match, Saturday, Feb. 4, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' John Isner returns the ball to Switzerland's Henri Laaksonen during a Davis Cup tennis match, Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Henri Laaksonen returns the ball to United States' John Isner during a Davis Cup tennis match, Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Marco Chiudinelli reaches to hit a shot from United States' Jack Sock during a Davis Cup tennis match Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Marco Chiudinelli reaches to return a shot from United States' Jack Sock during a Davis Cup tennis match Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Jack Sock tosses the ball for a serve to Switzerland's Marco Chiudinelli during a Davis Cup tennis match Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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United States' Jack Sock slides to return a hit from Switzerland's Marco Chiudinelli during a Davis Cup tennis match Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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FILE- In this March, 2016 file photo, Bob Bryan, left, and his brother Mike of the United States celebrate after defeating Australia's Lleyton Hewitt and John Peers in their Davis Cup doubles match in Melbourne, Australia. Bob and Mike Bryan announced Sunday, January, 22, 2017, that they are retiring from playing Davis Cup for the United States after 14 years with the team. (AP Photo/Andrew Brownbill,File)

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FILE - In this March 5, 2016 file photo, Jim Courier, right, captain of the United States Davis Cup team, talks to doubles players Bob, left, and Mike Bryan while playing against Australia's Lleyton Hewitt and John Peers during their Davis Cup doubles match in Melbourne, Australia. Bob and Mike Bryan announced Sunday, January, 22, 2017, that they are retiring from playing Davis Cup for the United States after 14 years with the team. (AP Photo/Andrew Brownbill,File)