Mainz failed to put up any resistance while Union relentlessly tripled their lead after Marvin Friedrich headed home Christopher Trimmel's free-kick in the 63rd minute for 3-0.
It was Flamengo's first victory in Brazil's top flight since they overcame local rival Fluminense 2-1 on September 9.
Sichuan was held to six of 26 on three-pointers and out-rebounded its opponents 44-30.
A few months ago, Bayern had signed Citizen star Leroy Sane for 50 million.
The South American zone's 2022 World Cup qualifiers had been scheduled to begin in late March but were postponed because of the coronavirus pandemic.
Colombia will host Venezuela in Barranquilla on October 9 before facing Chile in Santiago four days later in the opening fixtures of the South American zone qualifiers.
"I don't care about the result of the river-cross competition, I only want to feel the fighting spirit against waves," Zhu added. Enditem
For Chinese sports fans, their demand for sports events was suppressed for nearly half a year.
Wu Tongtong, who scored a game-high 30 points, helped Shanxi seal the win, while Fang Min pocketed a team-high 17 points for Henan. Enditem
After the third period, which saw many lead changes and ties, Sichuan managed a one-point lead heading into the final 10 minutes.
The player was found guilty of demonstrating "a discriminatory gesture," during the AFC Champions League game against Pakhtakor on September 30, 2020, in Doha.