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GLASGOW, SCOTLAND - MARCH 06: Andy Murray of The Aegon GB Davis Cup Team celebrates match point against Donald Young of the United States during Day 1 of the Davis Cup match between GB and USA at Emirates Arena on March 6, 2015 in Glasgow, Scotland. (Photo by Jan Kruger/Getty Images)

GLASGOW, SCOTLAND - MARCH 06:  Andy Murray of The Aegon GB Davis Cup Team celebrates match point against Donald Young of the United States during Day 1 of the Davis Cup match between GB and USA at Emirates Arena on March 6, 2015 in Glasgow, Scotland.  (Photo by Jan Kruger/Getty Images)