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GLASGOW, SCOTLAND - SEPTEMBER 19: Andy Murray of Great Britain hits a return during Day Two of the Davis Cup Semi Final match between Great Britain and Australia at Emirates Arena on September 19, 2015 in Glasgow, Scotland. (Photo by Jordan Mansfield/Getty Images for LTA)

GLASGOW, SCOTLAND - SEPTEMBER 19:  Andy Murray of Great Britain hits a return during Day Two of the Davis Cup Semi Final match between Great Britain and Australia at Emirates Arena on September 19, 2015 in Glasgow, Scotland.  (Photo by Jordan Mansfield/Getty Images for LTA)