LONDON, ENGLAND - NOVEMBER 13: David Goffin of Belgium plays a forehand in his Singles match against Rafael Nadal of Spain during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain celebrates a point in his Singles match against David Goffin of Belgium during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Julian Finney/Getty Images)
LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain looks dejected in his Singles match against David Goffin of Belgium during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 13: Rafael Nadal of Spain congratulates David Goffin of Belgium after his victory in their Singles match during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 13: David Goffin of Belgium celebrates victory in his Singles match against Rafael Nadal of Spain during day two of the Nitto ATP World Tour Finals at O2 Arena on November 13, 2017 in London, England. (Photo by Julian Finney/Getty Images)
