The hosts remained unimpressed and flabbergasted Hoffenheim with the equalizer at the hour mark when Kevin Freiberger controlled a pinpoint cross from Paul Milde to beat Baumann with a turn and shoot from 10 meters.
This was the first US Open final to be decided by a fifth-set tie-break, while Thiem became the first player in the Open Era to rally from two sets down in a US Open final.
Despite having the majority of the ball, Zall failed to make an impact as Cote d'Ivoire striker Jean Evrard Kouassi and Dong both squandered chances to level the game.
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.
Flick claims only to have 16 quality players, including the trouble-causing cases.
Marcos Alves broke the deadlock for Hebei in the 15th minute through a header after receiving Yin Hongbo's long pass.
It was the debut for Bratislava's new coach Darko Milanic who just signed with the team on Monday.
Alex Teixeira (R) of Jiangsu Suning breaks through during the 11th round match between Jiangsu Suning and Guangzhou R&F at the postponed 2020 season Chinese Football Association Super League (CSL) Dalian Division in Dalian, northeast China's Liaoning Province, Sept. 13, 2020. (Xinhua/Long Lei)
The ace claimed six ranking titles last season but failed to defend his world championship title in the season-ending tournament.
Monday sees two more matches with Chelsea travelling to Brighton, while Sheffield United entertain Wolves. Enditem
Saturday ends with newly-promoted Cadiz, who on Wednesday drew their last friendly of the summer 1-1 with Almeria, at home to Osasuna.