LONDON, ENGLAND - NOVEMBER 19: Winner, Grigor Dimitrov of Bulgaria speaks with David Goffin of Belgium following the singles final during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Winner, Grigor Dimitrov of Bulgaria speaks with David Goffin of Belgium following the singles final during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Julian Finney/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Grigor Dimitrov of Bulgaria celebrates victory following the singles final against David Goffin of Belgium during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Julian Finney/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Grigor Dimitrov of Bulgaria celebrates victory following the singles final against David Goffin of Belgium during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Grigor Dimitrov of Bulgaria celebrates victory following the singles final against David Goffin of Belgium during day eight of the 2017 Nitto ATP World Tour Finals at O2 Arena on November 19, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)
