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VALENCIA, SPAIN - APRIL 06: Rafael Nadal of Spain celebrates after defeating Philipp Kohlschreiber of Germany during day one of the Davis Cup World Group Quarter Final match between Spain and Germany at Plaza de Toros de Valencia on April 6, 2018 in Valencia, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images)

VALENCIA, SPAIN - APRIL 06:  Rafael Nadal of Spain celebrates after defeating Philipp Kohlschreiber of Germany during day one of the Davis Cup World Group Quarter Final match between Spain and Germany at Plaza de Toros de Valencia on April 6, 2018 in Valencia, Spain.  (Photo by Manuel Queimadelos Alonso/Getty Images)