LONDON, ENGLAND - NOVEMBER 14: John Peers of Australia partner of Henri Kontinen of Finland returns the ball during the doubles match against Jean-Julien Rojer of The Netherlands and Horia Tecau of Romania on day three of the Nitto ATP World Tour Finals at O2 Arena on November 14, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 14: Jean-Julien Rojer of The Netherlands partner of Horia Tecau of Romania returns the ball during the doubles match against John Peers of Australia and Henri Kontinen of Finland on day three of the Nitto ATP World Tour Finals at O2 Arena on November 14, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 14: Jean-Julien Rojer of The Netherlands and Horia Tecau of Romania look on during the doubles match against Henri Kontinen of Finland and John Peers of Australia on day three of the Nitto ATP World Tour Finals at O2 Arena on November 14, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 14: Henri Kontinen of Finland partner of John Peers of Australia returns the ball during the doubles match against Jean-Julien Rojer of The Netherlands and Henri Kontinen of Finlan Horia Tecau of Romania tto ATP World Tour Finals at O2 Arena on November 14, 2017 in London, England. (Photo by Julian Finney/Getty Images)
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LONDON, ENGLAND - NOVEMBER 12: Henri Kontinen of Finland and John Peers of Australia in action against Ryan Harrison of USA and Michael Venus of New Zealand in their doubles match 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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