From the kickoff, the "BVB" assumed control and implemented their offensively minded strategy while the Foals lurked for their chances on the counter.
The 31-year-old had one year left on his previous contract and would have been able to leave for nothing in the summer of June 2021.
Djokovic beat his fellow Serb Filip Krajinovic 7-6 (7), 6-3, while Nadal won 6-1, 6-3 against Dusan Lajovic, also of Serbia.
Top seeds Novak Djokovic and defending champion Rafael Nadal, who have first round byes, will begin their campaigns on Wednesday.
"Players like Riqui have something special, but it is going to be very complicated for him here as there is a lot of competition. I have told him that he has a future here, and we will think about what is the best way to succeed at Barca," he added.
Zhou, 22, drew 2-2 with compatriot Zhao Jianbo and Ricky Walden, but a 3-0 victory over Gerard Greene secured him top spot in the group.
Elsewhere, Villarreal came back from a goal down to take their first win of the season with a 2-1 victory at home to Eibar.
Middle blocker Wang Yuanyuan also returned from the national team to join Tianjin in their quest for the title.
After the result, Chongqing pocketed three wins consecutively to rank fifth, while Qingdao remain seventh among eight sides in the Suzhou division. Enditem
MADRID, Sept. 17 (Xinhua) -- Granada qualified for the third qualifying round of the Europa League with ease as they beat Albanian side Teuta 4-0 on Thursday.
"We are waiting for what the Ministry of Health and the president are going to say about sporting activity and give us direction and that is what we are going to do as to when football activity is starting and when there is a continuation of the league," he added.