The fact that the tie was decided with just one leg, rather than the traditional home and away format, meant the game was a potential banana skin for the Chinese-owned team making its first ever appearance in Europe, but Diego Martinez's side got off to a perfect start with two goals in 10 minutes.
Maximilian Eggestein's moment of madness allowed Vladimir Darida to pass into the path of Dodi Lukebakio, who finished off a fast break after beating Jiri Pavlenka from the edge of the box in the dying seconds of the first half.
"We surprised Al-Taawoun with our physical presence which gave us the upper hand," said Resan.
Flamengo had never before lost a Copa Libertadores match by a five-goal margin. Previously, their worst showing in South America's premier club competition was a 5-1 capitulation to Gremio in 1984. Thursday's result was also the heaviest defeat by defending Copa Libertadores champions.
Chengdu Xingcheng Habitat is the other team which notched up two wins from the first two rounds of the second-tier league. They beat Beijing BSU 2-0 in a second-round fixture on Wednesday.
In Group B, a late Hattan Bahebri strike helped Saudi Arabia's Al-Hilal defeat the ten men of Uzbekistan side Pakhtakor 2-1.
The 2023 AFC Asian Cup, which is scheduled to kick off in June, will be held in professional football stadiums in ten host cities: Beijing, Shanghai, Tianjin, Chongqing, Chengdu, Xian, Dalian, Qingdao, Xiamen, and Suzhou, where the renovation and construction of all venues has made significant progress.
On the other table on Friday, Stuart Bingham topped the group by winning three matches without losing any frames.
Although he had become a scapegoat at Real Madrid over the past couple of seasons, Bale was greeted by around 100 fans at the Tottenham training ground when he reported for his medical on Friday.
Kike Gonzalez put Eibar ahead in the 50th minute, but two goals in an eight-minute spell on 62 and 70 minutes from Gerard Moreno and Paco Alcacer gave Unai Emery his first triumph at the club and also highlighted the attacking talent at his disposal.
Both sides posed threats to the other, but no goals were scored in the first half. Chongqing once got a good chance to score in the stoppage time when Brazilian forward Fernandinho Silva was fouled by Cameroon midfielder Joseph Minala in the penalty area. After a VAR ruling, the referee finally canceled the penalty kick because of Fernandinho's handball.