Zall tried to add fresh attacking impetus by bringing loanee Dong Xuesheng and under-23 goalkeeper Wang Zhifeng on for the second half.
The reigning champions had 25 points after 10 matches and sealed a spot in the second stage.
The unseeded pairing got off to a superb start, as Siegemund in particular moved all around the court to put away shot after shot. After breaking twice, Siegemund/Zvonareva built up a 5-1 lead before securing the first set 6-4.
In contrast to Real Madrid, FC Barcelona have had a nightmare summer when all the problems came home to roost at the same time after their 8-2 thrashing to Bayern Munich highlighted their failure to renovate the squad adequately over recent years.
Jena's late chance was a wakening call for Bremen as new arrival Tahith Chong had all the time and space to finish off a fast break, scoring his first ever goal for his new club in the dying minutes.
Chongqing pocketed two wins consecutively to rank six in the league, only two points clear of Hebei in the Suzhou division.
Ryan Day also advanced on Sunday after finishing his three group matches with two victories and one draw. He even scored a maximum break in his 3-1 win over Rod Lawler.
With the draw, Luneng and Shenhua remain third and fourth ranked at the table with 17 and 13 points respectively.
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.
MADRID, Sept. 12 (Xinhua) -- The opening day of La Liga's 2020-21 season on Saturday saw wins for Granada and Osasuna in their games against Athletic Club and Cadiz in a weekend where Real Madrid, FC Barcelona, Atletico Madrid and Sevilla are not playing.
Evergrande broke the deadlock in the 40th minute with a moment of magic, as Paulinho dribbled past several defenders at the edge of the box, unleashing a rocket that went beyond an out-stretched Wang.