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LONDON, ENGLAND - NOVEMBER 19: Winner, Grigor Dimitrov of Bulgaria and runner up, David Goffin of Belgium hold their trophies 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 and runner up, David Goffin of Belgium hold their trophies 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)