"We played a little tight at the start. We improved later in the match, and showed our character," said Zhejiang coach Gu Jiaqing.
Eibar won for the first time this season as Kevin Rodrigues' 91st minute goal gave it a 2-1 triumph away at Valladolid in a frantic game on Saturday.
The 30-year-old, who has been capped once for Argentina's national team, has struggled for opportunities since joining Boca from Mexico's Cruz Azul in January 2019.
Shan was the main threat on Zhejiang's offensive end, constantly burying three-pointers and driving to the basket. She scored nine points in a 10-minute stretch as Zhejiang raced ahead 45-33 at the half.
FC Barcelona coach Ronald Koeman was left frustrated as the club failed to complete deals to bring central defender Alex Garcia and forward Memphis Depay to the club from Manchester City and Olympique Lyon respectively.
"We played great in the first half, but after bench players came in, they suffered a bit and failed to maintain the level on both ends," said Jiangsu coach Ding Tie.
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.
"Li Xiaopeng will take up the posts of vice manager and technical director of Luneng instead of head coach due to health reasons," said the club.
The last edition of the competition was held in June 2018 in Wuhan, China, as the host nation bagged all 11 gold medals. Enditem
Two-time Grand Slam winner Kvitova had to bounce back from 1-5 down in the opening set against Canada's teenager Leylah Fernandez to set round-of-16 clash with Zhang.
The Argentinian bested Nadal in the Rome Masters quarter-finals last month for his first win against the world number two.