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World No.2 Sinner had to dig deep to get his first break of the match, which tipped the first set in his favour. The Italian took the first four games of the second set to lay the foundation for victory, backed by a supportive crowd at Turin's Palasport Olimpico.

He will play his biggest rival and world No.1 Carlos Alcaraz for the final title of the season on Monday (AEDT) after the Spaniard destroyed Felix Auger-Aliassime in their semi-final, winning 6-2 6-4.

"It was a very tough match, especially at the beginning of the first set. Felt like [De Minaur] was serving great," Sinner, who has now reached the final of the season-ending championship for the third time in a row, said.

"In the second set ... my level raised and I tried to be a bit more aggressive, which worked very well."

No.7 seed De Minaur fended off two break points to hold the opening game of the match and was on the verge of a break after going 40-0 up in the second, but Sinner held his nerve to hold.

Neither player could get a break as the match stayed even until the 11th game, when Sinner's perfectly angled backhand evaded a stumbling De Minaur to put the Italian 6-5 ahead. Sinner held the next game with ease to clinch the first set.

Sinner dominated the second set, bringing up match point with a strong backhand volley before sealing victory with a powerful forehand that was well outside De Minaur's reach.

"Tomorrow I will enjoy, I will try my best to have the best possible result but in any case, it has been an amazing week," Sinner, who has yet to drop a set in the tournament, said.