Carlos Alcaraz's Japan Open title on Tuesday and Sinner's triumph on Wednesday marked the first time since 2020 that the world No.1 and No.2 both claimed trophies in the same week after Novak Djokovic (Dubai) and Rafa Nadal (Acapulco) managed the feat five years ago.
"It's a very, very special place for me," Sinner said during the trophy presentation in Beijing.
"My team, thanks for understanding and working with me. Not all the team is here, hopefully the rest are watching from home. We'll try to improve and push for more and see what the rest of the season looks like.
"But I'm very happy to share this (trophy) with all of you."
The four-time grand slam champion came into Wednesday's title match at the National Tennis Centre in Beijing after a hard-fought semi-final win over Australian Alex de Minaur, during which he struggled with physical problems caused by a stomach bug.
There were no signs of discomfort in his first meeting with 19-year-old Tien on Wednesday.
The Italian settled into the match with a break in the opening game and looked solid throughout to take the first set with a hold in the final game.
Tien, playing in his first final and bidding to become the youngest American ATP Tour champion since Andy Roddick in 2002, twice earned break points in the second set, but Sinner fended them off and built a 4-2 lead.
The 2023 champion then sealed the win to became the second man to claim multiple titles at the ATP 500 tournament after Serbian superstar Djokovic (2009-10, 2012-15).
"Many positive things, I'm very happy with where I am at the moment," said Sinner, who will now head to the Shanghai Masters as top seed in the absence of world No.1 Alcaraz following the Spaniard's withdrawal because of injury.
Tien beat Lorenzo Musetti and former world No.1 Daniil Medvedev in Beijing, and the final was closer than the scoreline suggested, with the teenager again demonstrating his great potential.
After reaching the final in Beijing, the American will break into the world's top 40 for the first time.
"You've shown throughout the whole season what a talent you are," Sinner told Tien.
"Keep going. You're playing incredible tennis. I wish you all the best for the rest of the season and obviously for your whole career ... hopefully we can share more moments like this in the future."
- with PA
