"We've had a few difficult days and some players haven't been 100% but we're confident of a positive result," he said. "We have a clear way of playing and hopefully it will pay off."
The inexperienced coach had to compensate that by squeezing every minute.
The Spaniard booked his berth in the final earlier in the afternoon by a straight-set 6-3, 6-3, 7-6(0) win over 12-seeded Diego Schwartzman, taking revenge for his Rome quarterfinal loss to the Argentine.
The Paris Saint-Germain forward provided two assists and showed no signs of the back injury that forced him to miss Brazil's last two training sessions before the match at Corinthians Arena.
"We improved our ball movement with the match going deep. Players had expected to win this match through an easy route. After halftime adjustment, we had a different look in the second half," said Zhejiang coach Gu Jiaqing.
"Since the end of last season I've been feeling more comfortable and scoring more goals," Falcao said. "Hopefully I can carry that form with me to the national team. Our main objective is to qualify for the World Cup and I'm as motivated as ever to help the team achieve that."
Tianjin's Zhao Fangxin wasted three free throws to tie the game when they trailed at 76-79 in overtime.
The venue for the finals, which is scheduled to be played on Dec. 19, will be confirmed in due course, AFC said. Enditem
Duvan Zapata put the hosts ahead in the 16th minute at Estadio Metropolitano with a lunging effort after Juan Cuadrado's driving run and perfectly weighted cross from the right.
The forward missed most of last season after knee surgery and although he was able to return after the break for the coronavirus, another knee injury interrupted his start to the new season.
In the constructors' standings, Mercedes remain well out in front on 391 points, ahead of Red Bull with 211, with Racing Point moving up to third on 120 points.