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PEREIRA, COLOMBIA - SEPTEMBER 20: Kei Nishikori of Japan signs autographs for Colombians after the Japanese team defeating the Colombian team during the Davis Cup World Group Play-off at Club Campestre on September 20, 2015 in Pereira, Colombia. Japan won the serie 3-2. (Photo by Gal Schweizer/LatinContent/Getty Images)

PEREIRA, COLOMBIA - SEPTEMBER 20: Kei Nishikori of Japan signs autographs for Colombians after the Japanese team defeating the Colombian team during the Davis Cup World Group Play-off at Club Campestre on September 20, 2015 in Pereira, Colombia. Japan won the serie 3-2. (Photo by Gal Schweizer/LatinContent/Getty Images)