Chongqing nearly scored their third before the break when Fernandinho got an exquisite pass from Adrian, but his shot hit the post.
She had hoped to make her comeback at Roland Garros, the main draw for which begins on September 27 and runs through to October 11, but has withdrawn from the event last week.
The club insisted that their measures and protocols around COVID-19 remain stringent. They even offered to test the Hull City team ahead of Tuesday's fixture, but the visitors declined the offer.
The deadlock was broken in the 37th minute as Huanghai's Gao Xiang jumped high above the Teda defender to head in Yang Yu's unexpected cross.
The goalkeeper protected his side from a bigger defeat after neutralizing the chances from Angelino and substitute Christopher Nkunku in the closing stages.
If Flamengo's secondary samples prove positive, the players will be isolated for 14 days before being tested again, according to CONMEBOL guidelines.
Napoli also got their new season off to a good start as the Coppa Italia holder dominated Parma 2-0 with Dries Mertens and Lorenzo Insigne on target.
In Friday's only other fixture, Bolivia's Jorge Wilstermann secured a 3-0 home win over Uruguayan side Penarol. Enditem
Both sides exchanged spikes from the very beginning until they tied at 12-12. Xue Yizhi then made four points from a block and three kills to initiate a 9-1 scoring run for Beijing who kept it until the end of the set.
The 24-time Norway international follows Josep Martinez, Hee-Chan Hwang, Benjamin Henrichs, Lazar Samardzic and Angelino as the sixth new arrival of the summer transfer period.
On the other side, Djokovic, who is striving for his 18th major, will kick off his campaign in Paris by taking on Sweden's Mikael Ymer.