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BRUSSELS, BELGIUM, BELGIUM - SEPTEMBER 20: Diego Schwartzman (ARG) prepares to return a forehand shot during the singles match between David Goffin of Belgium and Diego Schwartzman of Argentina on Day 3 of The World Group Semi Final Davis Cup match between Belgium and Argentina at Forest National Stadium on September 20, 2015 in Brussels, Belgium. (Photo by Jorge Luis Alvarez Pupo/LatinContent/Getty Images)

BRUSSELS, BELGIUM, BELGIUM - SEPTEMBER 20: Diego Schwartzman (ARG) prepares to return a forehand shot during the singles match between David Goffin of Belgium and Diego Schwartzman of Argentina on Day 3 of The World Group Semi Final Davis Cup match between Belgium and Argentina at Forest National Stadium on September 20, 2015 in Brussels, Belgium. (Photo by Jorge Luis Alvarez Pupo/LatinContent/Getty Images)