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.
Serie A teams are expected to consider the competing bids and to make a decision by the end of the month.
Guoan extended the lead just three minutes after the break as Teda's clearance went into the path of Renato Augusto who bent a curler into the top corner.
The absence of these key players had weakened Thomas Tuchel's side significantly as the Ligue 1 defending champions launched their title defence with a shocking 1-0 defeat at newly-promoted Lens on Thursday.
Athletic's pre-season has been hampered by six players testing positive for COVID-19 and injuries to others such as Yuri Berchiche, Inigo Martinez and Mikel Vesga and coach Gaizka Garitano could give minutes to impressive youngsters Unai Vencedor and Jon Morcilla, while COVID-19 also deprives Granada of veteran signing Jorge Molina.
Williams had to come back from a set and a break down to storm to a 4-6, 6-3, 6-2 win against Bulgaria's Tsvetana Pironkova while Azarenka dropped just one game against 16th seed Elise Mertens of Belgium to seal a spot in the semifinals.
"This sport is very entertaining," said Lu. "I hope more and more people can enjoy it." Enditem
La Liga kicked off on Saturday with a 0-0 draw between Eibar and Celta, before Yangel Herrera and Luis Milla gave Granada a 2-0 win at home over Athletic Club and Osasuna won 2-0 away at newly promoted Cadiz with goals from Adrian Lopez and Ruben Suarez. Enditem
"The communication during a match, the way you prepare for a match, how you do tactics, all that, it just fits really well," Siegemund continued. "That's something that you realize down the road."
Elsewhere on Sunday, VVV-Venlo booked a spectacular 5-3 win at FC Emmen, Heracles Almelo beat ADO Den Haag 2-0 and Vitesse was too strong for RKC Waalwijk, winning 1-0. The FC Utrecht-AZ match was postponed to give AZ more time to prepare for next Tuesday's match at Dynamo Kiev in the third qualifying round of the Champions League.
Elsewhere, Mainz survived a scare against fourth division club Havelse and booked their berth for the next round.