Mainz goalkeeper Robin Zentner had to be on guard to defuse Dani Olmo's effort in the 4th minute before Marcel Halstenberg headed just wide from a promising position four minutes later.
"We are confident in the system," said Zhang Chi, head of the CBA's Player Development Department.
Amadou Haidara (L) of Leipzig controls the ball under the defense from Karim Onisiwo of Mainz during a German Bundesliga match between RB Leipzig and 1.FSV Mainz 05 in Leipzig, Germany, Sept. 20, 2020. (Photo by Kevin Voigt/Xinhua)
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 22-year-old Lyu took a 2-0 lead but handed Selby several chances to end the game 2-2. It meant that Lyu finished second with one win and two draws.
Forward Serginho restored Jorge Wilstermann's advantage with a 56th-minute strike but Alves pulled his team level again with a smart finish after combining with Fabio Luciano.
The changes mean that the weekend will open with Villarreal at home to Eibar, with Villarreal looking to improve on an opening day's performance that saw them held 1-1 at home by newly promoted Huesca.
Dortmund's season opener this Saturday evening against Borussia Moenchengladbach might well deliver first impressions of how the top German league's 2020/21 story might end.
Mexico will host Costa Rica at Azteca stadium on September 30 before meeting the Netherlands in Amsterdam on October 7.
"He's an important leader for the team and a big part of what we're building. He wants to be up there with the best players in the world and leave his mark. He can achieve that here," said Arteta.
This week saw Koeman's men beat Girona 3-1 in another preparation game, but Saturday will be their last chance to get things right before things are for real next week.