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Britain's Andy Murray (2nd R) speaks to his teammate Britain's Jamie Murray as Britain's captain Leon Smith (C) speaks to chair umpire Carlos Ramos after a ball was called out during the doubles tennis match on the second day of the Davis Cup final between Belgium and Britain at Flanders Expo in Ghent on November 28, 2015. AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)

Britain's Andy Murray (2nd R) speaks to his teammate Britain's Jamie Murray as Britain's captain Leon Smith (C) speaks to chair umpire Carlos Ramos after a ball was called out during the doubles tennis match on the second day of the Davis Cup final between Belgium and Britain at Flanders Expo in Ghent on November 28, 2015.  AFP PHOTO / JOHN THYS / AFP / JOHN THYS        (Photo credit should read JOHN THYS/AFP/Getty Images)