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MELBOURNE, AUSTRALIA - MARCH 02: Lleyton Hewitt captain of Australia looks on during a practice session ahead of the Davis Cup Tie between Australia and the United States at Kooyong on March 2, 2016 in Melbourne, Australia. (Photo by Robert Prezioso/Getty Images)

MELBOURNE, AUSTRALIA - MARCH 02:  Lleyton Hewitt captain of Australia looks on during a practice session ahead of the Davis Cup Tie between Australia and the United States at Kooyong on March 2, 2016 in Melbourne, Australia.  (Photo by Robert Prezioso/Getty Images)