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GLASGOW, SCOTLAND - SEPTEMBER 20: Thanasi Kokkinakis of Australia hits a return during Day Three of the Davis Cup Semi Final match between Great Britain and Australia at Emirates Arena on September 20, 2015 in Glasgow, Scotland. (Photo by Jordan Mansfield/Getty Images for LTA)

GLASGOW, SCOTLAND - SEPTEMBER 20:  Thanasi Kokkinakis of Australia hits a return during Day Three of the Davis Cup Semi Final match between Great Britain and Australia at Emirates Arena on September 20, 2015 in Glasgow, Scotland.  (Photo by Jordan Mansfield/Getty Images for LTA)