The reigning champions had 25 points after 10 matches and sealed a spot in the second stage.
A horrible mistake from Valladolid keeper Jordi Masip gifted Real Sociedad a point in their game, which was played in a temperature of around 30 degrees centigrade in Valladolid's Nuevo Zorrilla Stadium.
The Shandong club then extended the lead as Lu Guangzu defeated Li Shipei 11-7, 11-8, 12-10 in the men's singles.
Alexi Stival's men are now sixth in the 20-team standings with 15 points while Sao Paulo are second with 18, two points behind leaders Internacional, who have a game in hand.
Celta were even closer to the drop than Eibar and have waved goodbye to important loanees Rafinha and Jeison Murillo, while Fiodor Smolov and Pione Sisto have also left.
Villarreal have also had a good summer after their fifth-place finish last season with the arrival of the experienced Unai Emery as coach followed by the bargain signings of Valencia due Dani Parejo and Francis Coquelin, along with a loan for the exciting winger Taka Kobe from Real Madrid.
Digao Silva pulled a late goal back for Fluminense when he headed in from an Egidio Pereira corner.
"My waist disc herniation has been acting up again," she said, adding that she would be back next year.
With the win against Medvedev, the 27-year-old Thiem improved to 3-1 in his head-to-head series with the Russian star and is entering his fourth Grand Slam final.
BRATISLAVA, Sept. 11 (Xinhua) -- Four-time world triple jump champion Christian Taylor of the United States failed to live up to expectations as he was beaten by local hero Tomas Veszelka at the P-T-S Meeting in Samorin, Slovakia, on Friday.
HANGZHOU, China, Sept. 10 (Xinhua) -- Welcoming the two-year countdown to the opening of the 19th Asian Games on Thursday, host city Hangzhou exudes confidence of delivering an Asiad that has "Chinese grandeur, Zhejiang style and Hangzhou flavor."