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VILLA MARTELLI, ARGENTINA - MARCH 08: Leonardo Mayer of Argentina celebrates after winning a singles match between Leonardo Mayer of Argentina and Joao Souza of Brazil as part of Davis Cup 2015 match between Argentina and Brazil at Tecnopolis on March 08, 2015 in Villa Martelli, Buenos Aires, Argentina. It was the longest Davis Cup singles match in history (six hours, 42 minutes) surpassing the six-hour, 22-minute clash in which John McEnroe beat Sweden's Mats Wilander in St Louis in 1982. (Photo by Gabriel Rossi/LatinContent via Getty Images)

VILLA MARTELLI, ARGENTINA - MARCH 08:  Leonardo Mayer of Argentina celebrates after winning a singles match between Leonardo Mayer of Argentina and Joao Souza of Brazil as part of Davis Cup 2015 match between Argentina and Brazil at Tecnopolis on March 08, 2015 in Villa Martelli, Buenos Aires, Argentina. It was the longest Davis Cup singles match in history (six hours, 42 minutes) surpassing the six-hour, 22-minute clash in which John McEnroe beat Sweden's Mats Wilander in St Louis in 1982. (Photo by Gabriel Rossi/LatinContent via Getty Images)