An emotional Ji, who burst into tears after the thrilling win, said she was aware of refreshing the league's all-time scoring record.
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.
Turkey responded well and created two chances in quick succession through Efecan Karaca and Yusuf Yazici in the 15th minute.
The 18-year-old Chang defeated Irish teenager Aaron Hill 4-2 in the first round.
"Freestyle football is attractive to the ordinary audience so it can help promote football," she said.
"We executed everything that we prepared as regards to defense except that we still struggled with defensive rebounds. In the second half, we didn't adjust properly to their zone defense," said Shandong coach Luka Sjekloca. Enditem
Now the top two seeds - Djokovic and Nadal - will face each other, which would offer big stakes for both sides to seek for.
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.
Jia said the league has provided some much-needed competitive action for the "Steel Roses".
"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."
"It was a difficult time for me. After thinking hard for almost a week, I decided to retire and go to college," Wang said.