But the visitors equalized just after halftime through Pereira, who headed in his first goal of the season after a Diego Ribas set-piece.
The Real Madrid star, who wore the captain's armband under the rotating leadership policy of manager Tite, said the team needed more time to gel following several changes to the starting eleven.
"I would love to finish my career being the player with more Grand Slams. But on the other hand, I have to do my way," Nadal said. "In terms of these records, of course, that I care. I am a big fan of the history of sport in general. But let's see what's going on when we finish our careers. We keep playing."
Added to this the fact that the race was run in much colder conditions than usual, and that both of Friday's practise sessions had been washed out, there was an air of uncertainty for teams and drivers as they began the race.
"It is true that the altitude is difficult. It can be suffocating. But what is really important is the flight of the ball and how that changes."
Du, who is also deputy minister of China's State General Administration of Sport, noted that the goal of the tournament is to promote the development of youth football in China.
The 29-year-old is expected to start for the five-time world champions when they meet Bolivia in Sao Paulo on Friday and Peru in Lima next Tuesday in the opening two rounds of South America's 2022 World Cup qualifiers.
Jia added that his team would play several warm-up matches with foreign women's football teams or local U-17 men's teams ahead of the playoff.
Facing a perfect Nadal, Djokovic was unable to hold any of his three service games in the first set, and finally secured his first service of the match in the opening game of the second set, after saving three break points. But the Spaniard quickly broke twice in the third and fifth game to storm to a 4-1 lead.
Luo Xinyu bagged 18 points for Jiangsu, who also got 14 points apiece from Xu Chenyan and Jiang Jiayin.
Messi put the hosts ahead in the 13th minute at La Bombonera after Lucas Ocampos was scythed down by Pervis Estupinan after a driving run into the penalty area. The 33-year-old now has 71 goals in 139 appearances for the Albiceleste.