Newly-crowned US Open winner Dominic Thiem also claimed straightforward victory as the Austrian beat 2014 US Open champion Marin Cilic of Croatia 6-4, 6-4, 6-2 earlier in the afternoon.
Flamengo had asked the Brazilian Football Confederation (CBF) to postpone the clash after reporting at least 16 positive coronavirus cases in their first-team squad, with only nine outfield players available.
Acheampong scored a goal in the 81st minute, but it was ruled out for offside.
The first match of the championship group will take place on October 16, with this season's CSL champions to be crowned on November 12. Enditem
The result at Rio de Janeiro's Maracana stadium, which came less than two weeks after Independiente whitewashed Flamengo 5-0 in Quito, guarantees the defending champions a place in the knockout phase.
All 12 Shanghai players in the match list made the scoreboard, with Zhang Zhiting and Li Yingyun scoring 15 and 10 points respectively.
DALIAN, China, Sept. 27 (Xinhua) -- Bi Jinhao struck double to give Shanghai Shenhua a 2-0 win over Henan Jianye in the 14th round of the Chinese Super League (CSL), while Jiangsu Suning beat Shenzhen FC 1-0 on Sunday to climb up to second in Dalian Division.
Registered runners will now have the choice to defer their registration into next year's event or receive a refund of their entry fee.
Guardiola fielded new signing Nathan Ake and youngster Eric Garcia, neither of whom is six feet tall.
The following is the 28-man roster:
QINGDAO, China, Sept. 30 (Xinhua) -- Zhang Yufei, who broke the Asian record in the women's 100m butterfly in the preliminary heat on Tuesday, captured gold in the final at the Chinese national swimming championships here on Wednesday.