The Czech player fired 23 winners in the match in which she converted four of her nine break points. Despite missing a chance to serve for the win in the eighth game of the second set at 5-2, she clinched it when an opportunity appeared again in the tenth to wrap up the victory with a love game.
Dongguan scored 10 points in a row early in the first quarter, before Zhejiang responded with the same scoring run through consecutive layups and foul shots, leading 20-17 at the end of the quarter.
Meanwhile Southampton claimed a routine 2-0 victory at home to West Bromwich Albion, who is still searching for its first win of the campaign.
Nadal will face Sebastian Korda, the son of 1998 Australian Open winner Petr Korda, in the next round. The American youngster secured his first appearance in a Grand Slam round of 16 by beating fellow qualifier Pedro Martinez 6-4, 6-3, 6-1 to advance.
The two-time Grand Slam winner committed just seven unforced errors throughout the one-sided encounter and broke her opponents six times.
"We showed our character," Jiangsu coach Ding Tie said. "But after some young players substituted in, the level of our defense went down."
Elche are currently 16th in the 20-team La Liga standings with one win from their first three matches of the season. Enditem
Li felt a bit uncomfortable about Shandong's double team early in the match, but soon get used to that, making two baskets and feeding Chen's two layups, to help Inner Mongolia race ahead 19-15 in the first quarter.
Cordoba has scored two goals in three Bundesliga matches this season following his September move from FC Koln.
Dongguan opened the first quarter on an 11-2 run, sparked by five straight points from Yang Shuyu.
"In the second set and the third set, I had a lot of opportunities, also easy opportunities," said Schwartzman after his 20th victory of 2020. "That's why I was really upset, really angry with myself at that time ... when I was close to winning in those sets. I couldn't do it."