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BIRMINGHAM, ENGLAND - MARCH 01: Kei Nishikori of Japan shakes hands with Andy Murray of Great Britain during a practice session ahead of the start of the Davis Cup tie between Great Britain and Japan at Barclaycard Arena on March 1, 2016 in Birmingham, England. (Photo by Jordan Mansfield/Getty Images for LTA)

BIRMINGHAM, ENGLAND - MARCH 01:  Kei Nishikori of Japan shakes hands with Andy Murray of Great Britain during a practice session ahead of the start of the Davis Cup tie between Great Britain and Japan at Barclaycard Arena on March 1, 2016 in Birmingham, England.  (Photo by Jordan Mansfield/Getty Images for LTA)