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.
Williams will take on Azarenka in the semifinals, who triumphed against Mertens 6-1, 6-0.
The French Ligue 1 defending champions added that the deal included a purchase option when the loan ends next summer.
Elsewhere, Sheffield United impressed in their return to the top-flight last season and now need to repeat that in what could be a tough second season, Burnley will continue to present teams with a physical challenge under Sean Dyche, while Danny Ings' goals will play a major role in determining Southampton's fate.
The former Barca striker got a straight red for slapping on the back of Alvaro Gonzalez's head.
The 30-year-old came off the bench in the 67th minute and rifled home a low 35-yard free-kick in stoppage time as the hosts secured a barely-deserved point at their Vila Belmiro stadium.
Wuhan and Shanghai were jointly leading the league both with a 6-0 record prior to Saturday's clash. In stoppage time of the intense match which Wuhan won by 3-0, Camila Martins De Aguiar of Shanghai was shown a direct red card for a flagrant tackle and then struck some Wuhan players, which then turned into a brawl.
SUZHOU, China, Sept. 11 (Xinhua) -- Matheus Nascimento's penalty at his 100th game in Shijiazhuang Ever Bright handed his team a 1-0 win over Wuhan Zall in the 10th round of the Chinese Super League (CSL) here on Friday.
The anarchy in injury time started with a tussle between Argentine pair Dario Benedetto of Marseille and Leandro Paredes of PSG, as the two players were both shown their second yellow cards and were sent off.
Messi received a one-match ban for an altercation with Chile's Gary Medel in the Copa America third-place playoff in July last year, which Argentina won 2-1.
"We have lost quality with Ivan Perisic and Philippe Coutinho and need to replace that to face this season's challenges," Flick said. Enditem