Damjan Bohar scored the only goal for Slovenia in the 28th minute.
In the 69th minute, the Shenzhen side got another goal-scoring opportunity. However, Harold Preciado's close-range shot was saved by Shenhua goalkeeper Zeng Cheng and then John Mary's follow-up header hit the woodwork once again.
Barcelona, who have been supported by the Spanish football league (La Liga), took a different viewpoint, insisting that if he wanted to join a different club he would have to pay the 700 million euro release clause in his contract.
In the men's singles, Russian players Daniil Medvedev and Andrey Rublev joined Thiem in the last eight while Australia's Alex De Minaur also advanced. Enditem
The other match on Friday saw Shenzhen Jiazhaoye held Shanghai Shenhua to a 0-0 draw.
Greece won 2-1 in Kosovo to top Group C3 on goals scored from Slovenia, who saw off Moldova 1-0. Enditem
Botafogo looked set for a memorable victory when former Chelsea forward Salomon Kalou struck his first goal for the club in the 75th minute.
"I think lots of people didn't think it was possible to throw a javelin more than 95 meters in a closed stadium. I did it and I think there is a lot space for improvement. Very small differences, tiny differences, can make a difference of many meters."
"A second test will be carried out within 72 hours and then another every five days as long as they remain in the tournament," he added.
The 2020 CBSL runs from August 27 to September 14 in Chengdu. Due to the impact of the COVID-19 pandemic, all games are played behind closed doors. Enditem
"I was playing well today," said Thiem. "I had a good plan for the match. He's very dangerous when he can dictate with his forehand. I was trying to avoid that. He also has very, very fast legs. I was trying to play my fastest tennis to keep him on the backhand, to not let him dictate with the forehand. I did that very well today."