The shorthanded German coach had to field several youngsters like 18-year-old league debutants Kays Ruiz-Atil and Arnaud Kalimuendo and 20-year-old goalkeeper Marcin Bulka in the starting line-up in Wednesday's match.
Hertha tried to respond but for all that Braunschweig doubled their advantage through Maximilian Mittelstadt, who deflected a header into his own goal with 17 minutes gone.
It was the debut for Bratislava's new coach Darko Milanic who just signed with the team on Monday.
Zverev completed a stunning comeback in his semifinal, rallying past Pablo Carreno Busta of Spain 3-6, 2-6, 6-3, 6-4, 6-3 to reach his first Grand Slam final while Thiem dug deep and displayed his trademark fighting spirit to outlast third seed Daniil Medvedev of Russia 6-2, 7-6(7), 7-6(5).
The drill was jointly carried out by the Red Cross societies in Beijing, Tianjin and Hebei.
In other matches, Guizhou Hengfeng drew 1-1 with Zhejiang Energy Greentown, and Changchun Yatai edged Heilongjiang Lava Spring 2-1.
Monday sees two more matches with Chelsea travelling to Brighton, while Sheffield United entertain Wolves. Enditem
Thiem was runner-up at the Australian Open earlier this year and also lost in the French Open finals in 2018 and 2019.
In other fixtures on Thursday, Palmeiras won 2-0 at Corinthians and Atletico Goianiense beat Vasco da Gama 2-1 in Rio de Janeiro. Enditem
While coach Hansi Flick is demanding that gaps are closed quickly in his team to ensure a successful 2020/2021 season, the former president accuses Liverpool and Manchester United of trying to blackmail the club.
In Sao Paulo, Palmeiras were held to a 2-2 home draw by Sport Recife. Willian and Ze Rafael struck first-half goals for the hosts while Iago Maidana and Luis Mugni were on target for Sport.