Jiangsu had slight advantage from the very beginning and moved towards winning the first set gradually and steadily.
Mainz were unable to put up resistance but were lucky enough that Forsberg rattled only the woodwork in the 31st minute and Angelino hit the side netting from tight angle before the half time.
Qingdao scored the consolation goal from Denis Popovic's penalty in the dying minutes.
Manchester United's first Premier League game of the season ended in a shock 3-1 defeat at home to Crystal Palace on Saturday as Old Trafford old boy, Wilfred Zaha scored twice against his former club.
Chongqing posed more of a threat than Shijiazhuang after the game started. After the goalie saved brilliantly from midfielder Chen Jie's long-range shot in the fifth minute, Chongqing got another corner kick and an accurate cross from right-back Jiang Zhe, helping Adrian to score at close range to make it 1-0.
Fans and half of the club are puzzling about who could be the rescuer leading the side out of this deep crisis. Former Schalke and Leipzig coach Ralf Rangnick is one name in the list.
Roger Guedes and Graziano Pelle scored in the first half to seal the win, which helped Shandong build an unassailable lead with 23 points in the Dalian group.
Meanwhile, Samaria also revealed that Robert Nauseb will be his assistant coach following the resignation of Woody Jacobs earlier this month. Enditem
The teams had been due to meet at Estadio Azteca in Mexico City on September 30, but Costa Rican federation Fedefutbol said it had no choice but to withdraw from the match because of quarantine rules.
In the Meizhou division, Guizhou continued their winning drought after a bitter defeat to Liaoning Shenyang Urban, while Meizhou Hakka stunned Jiangxi Liansheng 4-0.
"The players are asymptomatic and have been isolated under the supervision of the club's medical department," Flamengo tweeted on Sunday night.