Djokovic beat his fellow Serb Filip Krajinovic 7-6 (7), 6-3, while Nadal won 6-1, 6-3 against Dusan Lajovic, also of Serbia.
Dortmund remained in full control of proceedings and should have added a sixth goal, but Julian Brandt lacked accuracy in the closing period.
Dominic Dale, the world number 70, also reached Stage Two after topping his group with two wins and one draw.
Though affected by the COVID-19 pandemic, the past CBA season was regarded as a remarkable one in the league's 25-year history.
In the 28th minute, thanks to a short cross from Cedric Bakambu on the midfield, Renato Augusto dribbled through defender Ding Haifeng and contributed a calm tap-in to pull one back.
The ceremony was held in the gymnasium of the Xi'an Olympic sports center. "As a host city of the major events, Xi'an will spare no efforts in organizing each activity. We will make great memories and try our best to hold the 14th National Games without any problems," said Wang Hao, the vice president of the event's organizing committee.
Several government officials have underlined that the permission depends on the outcome of the project. In case of violations, a new ban could be the result.
Real Madrid have only had one preparation game and although that saw them brush past Getafe, there have to be some doubts over match fitness. Meanwhile Eden Hazard is unlikely to play, while by the time the match kicks off both Gareth Bale and Sergio Reguilon will probably have joined Tottenham.
"We've taken note of all of his personal and technical characteristics as well as watching him play," Tite told a virtual news conference. "He is a new emerging talent in an important position," he added.
Considering that the Bundesliga's curtain-raiser between treble-winning Bayern Munich against FC Schalke may still be played behind closed doors as the city of Munich is reporting a rate of over 40.
Since the approval of the COVID-19 Relief Plan in June, FIFA has received applications from over 150 member associations.