The sixth-seeded Bulgarian claimed the title at the season-ending ATP Finals on Sunday, prevailing on his fifth match point to beat David Goffin 7-5, 4-6, 6-3 in the final.
It wasn't the Roger Federer-Rafael Nadal matchup many fans had hoped for, but they were left satisfied as the two 26-year-olds delivered the longest final since the tournament returned to a three-set format in 2008.
Goffin's adjustments paid off early as he broke Dimitrov's first two service games either side of losing his own, before settling down to control the opener.
Dimitrov's confidence carried into the second set, where he brought up the first break point in the sixth game, only for Goffin to produce a stunning cross-court backhand winner to save it.