Dongguan established a 22-12 advantage after the first quarter, with Dilana scoring 10 points to lead the way.
Zhao Xuetong had 19 points for Sichuan, Hu Yueming and Gao Song each got 17 points. Shen Yi contributed 18 points and eight assists for Dongguan.
Alba had to limp off in the 74th minute and was replaced by new signing Sergino Dest, who played on the left of the Barca defense, despite being right-footed.
Shanxi coach Li Ge gave a high appraisal of some of his veterans' performance.
The financial impact of the pandemic on football has been apparent, the former Leipzig coach said.
Peng Szu-Chin led Shanghai's charge with 25 points. Li Yingyun and Zhang Zhiting contributed 24 and 21 respectively. Zhang also grabbed 11 rebounds.
The 31-year-old, who is to face No. 7 seed Petra Kvitova in the next match, also became the first Chinese singles player since Li Na in 2012 to reach the fourth round at Roland-Garros.
The Czech player found rhythm just in time to win nine consecutive games to finally secure her 90th career main draw victory on clay.
Resentful of refereeing, Wuhan coach Li Xin was given two technical fouls in a row resulting in her ejection early in the last quarter. Wuhan could not truly put a scare into Xinjiang during the second half.
Xinjiang registered a balanced stat sheet in offense with five players scoring in the double figures, led by Han Xu's 13 points and 10 rebounds.
China's Shi Yanghe and Zhao Jiangqiong won the men's and the women's 65km races respectively.