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2nd February 2018, Cair Sports Center, Nis, Serbia; Tennis Davis Cup, Serbia versus USA; Sam Querrey (USA) returns during day one of the Davis Cup World Group first round between Serbia and USA (Photo by Nikola Krstic/Action Plus via Getty Images)

2nd February 2018, Cair Sports Center, Nis, Serbia; Tennis Davis Cup, Serbia versus USA; Sam Querrey (USA) returns during day one of the Davis Cup World Group first round between Serbia and USA (Photo by Nikola Krstic/Action Plus via Getty Images)