Rennes had the chance to win all three points in stoppage time but Steven Nzonzi's header hit the post.
"If you win 4-0, you have to be happy. We will analyse today's game in a couple of days but for now we are delighted. Today it was important to be effective when it mattered most," Union head coach Urs Fischer said.
Although concerns are increasing among fans, as one of Germany's most prominent sides might fail to secure its first-tier participation for next season, the former teacher claimed to believe in the team's potential.
Freiburg staged a well-positioned defense from the kickoff and was able to keep Lucien Favre's men on the distance in the opening stage.
"We played a little tight at the start. We improved later in the match, and showed our character," said Zhejiang coach Gu Jiaqing.
The 2019 ATP Finals champion will face Russia's Andrey Rublev for a semifinals place in the next round. The 22-year-old Rublev recovered from a one set down and trailed by 5-2 in the second to knock out Marton Fucsovics 6-7 (4), 7-5, 6-4, 7-6 (3) in the last men's round of 16 clash.
On the other hand, Michalovce and Nitra are leading the rankings after two victories in succession. Kosice, Nove Zamky, and the Hungarian team Miskolc are still in quarantine.
Shaanxi's Chen Yanyu was an assist shy of a triple-double with 21 points, 12 rebounds and nine assists. Li weighed in with 19 points.
After both exchanged serves in the following two games, the former world No. 23 then delivered a dominant performance in the tie break to seal the first set.
Liverpool's defense was overrun for the entire 90 minutes at Villa Park with Ollie Watkins scoring a first half hat-trick, Jack Grealish scoring twice and John McGinn and, new arrival, Ross Barkley also getting in on the act.
"We want to play good football, whether it be at sea level, at high altitude, on the road, or at home," Farias told a news conference, urging Bolivians to "have faith in his players".