14 October, 2017
Roger Federer is the only player who can stop Nadal sealing the year-end honour for a fourth time.
6-4 in two hours and 35 minutes.
The world No 1 persevered 6-4 6-7 6-3 to book a semi-final with Marin Cilic, and record a second win over Dimitrov in as many weeks.
"I'm glad to reach the semi-finals in this tournament, but to be honest now, as I say always, health is the first of all of my life", Del Potro said.
"But if nothing risky happened, I will be here to play tomorrow and doing my best".
The second semifinals match will feature Roger Federer, who faces Juan Martin del Potro for the 23rd time in his career.
Meanwhile, Cilic's quarter-final win over Albert Ramos-Vinolas puts him ahead of Dimitrov at No 5 in the race to the ATP World Tour Finals in London.
"It was a very tough match".
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The country, however, withdrew the offer after it was struck by two major earthquakes in early September. That's going to have to be - you know, you can say goodbye to that.
"Just focus on holding that momentum".
Trailing 3-2 in the decider, Dimitrov's forehand crashed into the net to hand Nadal the break he needed.
The two friends headed into a deciding set with Dimitrov in the ascendancy and the pro-Nadal crowd fearing an upset.
But Nadal took the match, although not without some difficulty, losing the second set on a tie-break.
A relieved Nadal looked up to the heavens and raised his arms at the end.
Zverev, 20, had an in-match meltdown when he lost the fifth game of the final set after having a 40-15 lead.
And then came the turning point - and a flash of anger from third seed Zverev - as he yielded the crucial service break to go 3-2 down in the third set.
However, on his return to action he immediately broke Troicki's serve and went on to win.