Dortmund remained in full control of proceedings and should have added a sixth goal, but Julian Brandt lacked accuracy in the closing period.
"I felt today I really executed the game very precisely," Azarenka said. "I was moving really well. I made the ball very long. So I felt I played well. I found all the right answers to everything she was trying to make, so I'm very happy with that."
According to the Chinese Football Association (CFA), league A was divided into three groups in three cities: Chengdu; Changzhou; and Meizhou.
The region's premier club tournament, the Copa Libertadores, was due to resume on Tuesday, having been suspended in mid-March.
Williams had to come back from a set and a break down to storm to a 4-6, 6-3, 6-2 win against Bulgaria's Tsvetana Pironkova while Azarenka dropped just one game against 16th seed Elise Mertens of Belgium to seal a spot in the semifinals.
Jiangxi dominated the game at the beginning as Andy Russel put the newly-promoted side ahead in the 10th minute through a close-range header.
"I started taking the ball much earlier. I started taking the ball more on the rise. I started giving myself the chance to be the one that is aggressive," Zverev added. "I think in the first few sets, Pablo was the one dictating much more than I did. This is how the match slowly turned around."
"This is the first formal game since the pandemic, to me, it is a test which will provide a reference for my following winter training." Enditem
In the other game, Jiangsu Suning fumbled a 3-1 lead against Guangzhou R&F, only to slip to a 3-3 draw.
Fernandinho created the third goal of Chongqing six minutes later, breaking the rivals solid defense as a left-winger and helping Mierzejewski fire in close range through an accurate low pass.
While consensus among the F1 fraternity was that the Italian Mugello circuit's fast sweeping turns and frequent undulation would be the season's biggest physical challenge for the drivers, there were fears that a lack of heavy braking zones would make overtaking difficult.