Both sides struggled to create clear scoring opportunities, but as the match seemed to head for a draw, a low drive from Quintana put Chengdu ahead in stoppage time.
Around 16,000 spectators were allowed in to watch the game in Budapest's Puskas Arena. Enditem
But Flamengo defended stubbornly thereafter to secure their third win from four matches.
Roger Guedes and Graziano Pelle scored in the first half to seal the win which helps Shandong build an unassailable lead with 23 points in the Dalian group.
"We will apply the same rules at Roland Garros as elsewhere. We will go from 5,000 to 1,000," he told France 2 TV.
Andreescu, the 2019 US Open champion, missed the opening months of the year because of a knee injury before the pandemic forced the suspension of the sport.
DALIAN, China, Sept. 21 (Xinhua) -- Shanghai Shenhua and Jiangsu Suning played out a 0-0 stalemate in the 12th round of the Chinese Super League (CSL) here on Monday.
Prior to the game, both sides needed a victory to secure them a top four berth with only two games left in the Suzhou division.
It is the 16th straight win for Duplantis, who set the world outdoor record of 6.15m in Rome last week and improved the world record to 6.18m on the World Indoor Tour in February. Enditem
"For me and my national team mate Gong Xiangyu, this is our first time to compete in the Chinese Women's Volleyball Championship. Of course we want to deliver our best performance here," said Jiangsu captain Zhang Changning.
Andreescu beat American player Serena Williams at Flushing Meadows 12 months ago to become Canada's first Grand Slam singles champion. She had earlier been forced to skip the defence of her US Open crown due to her injury. Enditem