In spite of the overwhelming score line, Carreno Busta didn't actually play badly, but instead, all credit to Dimitrov who displayed a near-perfect performance.
Sock, who saved four match points against Dimitrov in Indian Wells and one in Montreal two years ago, before going on to win on both occasions, saved three more, but at the fourth time of asking the Bulgarian wasn't to be denied. I'm the victor of the tournament.
Infused with renewed belief, the Belgian held his nerve to clinch the set 6-4. "He's still playing such a nice tennis", added Goffin.
"Right now it's a great platform for me to build on for next year".
Dimitrov, coached by Murray's former hitting partner Daniel Vallverdu, is only the second ATP Finals debutant to win the title since John McEnroe defeated Arthur Ashe in 1978.
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The psychological damage could have been great given the Bulgarian had wiped away his opponent with the loss of only two games last Wednesday in their group game, but it lasted only until midway through the second set, when Goffin broke and went on to level the score.
Thiem, though - also on a recent run of bad form - was delivering his share of mindless errors; one particularly mistimed backhand fired off the frame and well up into the stands, and was met with a pantomime "ooh" from the crowds.
He has won with 7: 5, 4: 6 and 6:3, reported Nova TV.
Thiem then received a medical timeout for a left knee problem. "It's the only game maybe I didn't serve well".
The second game of the second set was to prove a turning point as Goffin, beaten 6-2 6-1 by Federer in Basel last month, broke the Swiss's serve with a forehand victor and then consolidated his lead to take the match into a decider.
That said, Goffin should provide some very watchable tennis, and the sport is - or at least should be - about more than just the "Big Four/Five". Honestly, I don't know what to do tomorrow. "Then the semi-final, to beat Roger for the first time here in such a big event, big tournament, it was the ideal moment", Goffin, who beat a hobbling Nadal on Monday, said. He played well. He didn't miss. "I think now definitely we going to sit down with the team and reassess the whole year, see what we've done good, what we can improve".
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