"The plan was to put Neymar close to Mbappe. We chose an offensive structure. We tried something and I have a lot of confidence in my team," Tuchel said after the match.
Fujian had little chance to score in the third set. Yang Yi then concluded the game with a serve.
The other two German participants - RB Leipzig and Borussia Monchengladbach - have harder tasks in Groups F and B respectively.
The 12-time champion also improved his record at Roland Garros to 95-2 with this win.
Jiangsu registered three-pointer shooting efficiency, with Gong Li and Liang draining shots beyond the arc on successive possessions to set up a 17-point advantage into half-time.
31-year-old Sunjic, who stands 1.94m tall, has played for many clubs across Europe, including VfB Stuttgart, S.S.D. Palermo and FC Dynamo Moscow. He also represented his country in the 2014 FIFA World Cup in Brazil.
Shandong's Ji Xinjie, who won the title in the men's 400m freestyle on Sunday, secured his second gold medal in the men's 200m freestyle in 1:47.42 on Monday.
New arrival Nayef Aguerd's goal after 33 minutes put Rennes in front. Serhou Guirassy scored a brilliant volley set up by winger Romain Del Castillo in the 52nd minute to extend Rennes' lead, before Adrien Hunou added the third in the closing period with a superb lob.
China's General Administration of Sports has listed the tournament as one of six major sports events during the "Golden Week" holiday.
DALIAN, China, Sept. 27 (Xinhua) -- Jiangsu Suning defeated Shenzhen FC 1-0 in the 14th round of the Chinese Super League (CSL) here on Sunday, winning a ticket to the second phase.
But there still is a long way to go for Chinese players. On the statistical front, foreign players occupied all the spots in the top 10 highest goal scorers, with Guoan striker Bakambu equalling Hebei China Fortune's Marcos as top scorer on 11 goals apiece.