Jorginho opened the scoring for the Blues with a penalty in the 23rd minute after debutant Timo Werner was tripped by Brighton keeper Mat Ryan.
There were also seven goals in the game between the newly-promoted pair of Leeds United and Fulham, with Leeds winning 4-3 to claim their first points of the season.
"It is a possibility and it could be for other players as well. 20-year-olds like him have to play, and they can't be stopped. We have reached some conclusions in the past three weeks and Riqui has too much competition," he explained. Enditem
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From then on, Arsenal were firmly in control, and took the lead in the 8th minute when Alex Lacazette bundled home from close range.
Thiago began his career at FC Barcelona, progressing through the youth system with his brother Rafinha, and said one reason he joined Liverpool was that it had a "family" feeling.
Tan sealed the win for Changchun with a drive in the 81st minute.
The match ended 1-1 at full-time, and both sides had opportunities to win in a penalty shoot-out but Qian Jiegei hit the bar while R&F scored all five to seal the win.
The region's qualifiers are scheduled to begin in October, more than six months later than originally planned because of the global health crisis.
"It is a good start to the Bundesliga season but most importantly, we won today. I am of course delighted that I was able to help my team with a goal," Hertha defender Pekarik said.
Dalian ended the impasse in the 33rd minute when Swedish winger Sam Larsson assisted Salomon Rondon to net a stunning long-range strike.
"My buddy, I always believe you, support you and love you," Beijing teammate and Chinese international Zhai Xiaochuan wrote.