LONDON, ENGLAND - NOVEMBER 12: Pierre-Hugues Herbert and Nicolas Mahut of France support each other in their match against Jean-Julien Rojer of Netherlands and Horia Tecau of Romania in the doubles during day one of the Nitto ATP World Tour Finals tennis at the O2 Arena on November 12, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 12: Jean-Julien Rojer of Netherlands and Horia Tecau of Romania celebrate winning a game against Pierre-Hugues Herbert and Nicolas Mahut of France in the doubles during day one of the Nitto ATP World Tour Finals tennis at the O2 Arena on November 12, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 12: Pierre-Hughes Herbert and Nicolas Mahut of France in action against Jean-Julien Rojer of Netherlands and Horia Tecau of Romania in their first doubles round robin match during the Nitto ATP World Tour Finals at O2 Arena on November 12, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
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LONDON, ENGLAND - NOVEMBER 12: Pierre-Hughes Herbert and Nicolas Mahut of France in action against Jean-Julien Rojer of Netherlands and Horia Tecau of Romania in their first doubles round robin match during the Nitto ATP World Tour Finals at O2 Arena on November 12, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
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Getty Images Sport Clive Brunskill

LONDON, ENGLAND - NOVEMBER 12: Pierre-Hugues Herbert with an injured Nicolas Mahut of France against Jean-Julien Rojer of Netherlands and Horia Tecau of Romania in the doubles during day one of the Nitto ATP World Tour Finals tennis at the O2 Arena on November 12, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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Getty Images Sport Julian Finney