The undersized Fujian blockers found it hard to stop Shanghai's high-flying spiker Zhang Yichan soon after the start of the first set.
The swimmers' performances at the championships will act as an important reference for their qualification for next year's Tokyo Olympic Games. Enditem
Alcacer then showed neat footwork halfway through the second half to ensure the points for Villarreal and leave Alaves in trouble.
Shanghai Shenhua wrapped up with 21 points on the fourth place in the Dalian group, while Henan languished at the bottom with six points.
The former world No. 1 is to face a tougher challenge in the second round against 2017 champion Jelena Ostapenko of Latvia, who knocked out American Madison Brengle 6-2, 6-1.
The following is the 28-man roster:
By contrast, Bottas, who had started third, inherited the lead after Hamilton's pit stop, and was able to make his own stop on lap 27 without losing the first place that he would then hold to the end.
On Saturday, a lower labor court suspended the match, citing a high risk of infection among players, officials, coaching staff and other workers.
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros winner.
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.
"New technology will deeply change the sports world," said Wang Yuxiong, professor of China's Central University of Finance and Economics.