Jiangsu were placed second in the group after the third round.
The Blanquirroja are aiming to qualify for their second consecutive World Cup, having ended a 36-year drought to earn a place at the 2018 tournament in Russia.
The first 45 minutes were entertaining, but after the break Barca began to look fatigued. Ronald Koeman made several changes, bringing Francisco Trincao, Pedri and Miralem Pjanic into the action, while Sergino Dest made his debut for the injured Jordi Alba. Despite Trincao having a late shot saved, Barca didn't do enough to win, while Sevilla looked happy with a point.
Earlier, Schwartzman knocked out third seed Dominic Thiem in a thrilling marathon battle which lasted over five hours, winning 7-6 (7-1), 5-7, 6-7 (8-6), 7-6 (7-5), 6-2.
Mainz were unable to gain a foothold into the first half and had to wait until the 38th minute to get their first chance on target, as Jean-Philippe Mateta's header came close.
World 5,000m champion Obiri maintained her unbeaten streak this season by winning the women's race in 15:06.36.
Fujian cut the deficit to nine points in the third period, but their fightback was halted by Dong and Huang's combined efforts inside-out, and they could not truly threaten Zhejiang thereafter.
After both exchanged serves in the following two games, the former world No. 23 then delivered a dominant performance in the tie break to seal the first set.
The Grand Prix Final had been scheduled for December 10-13, 2020 with the World Cup Short Track a week later. Both events were postponed "in consultation with all stakeholders and considering the pandemic developments," the ISU announced in a statement on Friday, with re-scheduling possibilities under discussion.
Real Madrid has a deeper squad than Barca, as the fact that they were without Dani Carvajal, Eden Hazard, Alvaro Odriozola and Tony Kroos on Sunday and still won shows, but Courtois' displays mean that so far some of the results have been much better than the actual performances.
"It was a very strong and tough defense. They played with a lot of contacts, and it was not easy to score, with a lot of turnovers and missed shots," he commented. Enditem