Athletico capitalized on the numerical advantage when Walter, unmarked inside the 18-yard box, struck his first goal of the campaign.
The seven-time German Champions (last in 1958) and five-time cup winners (last in 2011) boasts one of Europe's most successful academies.
The hosts almost made it four moments later but Matthias Ginter hacked Felix Passlack's shot off the goal line.
It's against all odds for second division surprise Arminia Bielefeld. Fans can expect passionate football with the clubs 8th first tier season but doubts remain if the quality is taking the new arrival over the finish line.
The emblem and mascot of the 11th China's National Games for Persons with Disabilities & the 8th China National Special Olympic Games were unveiled at the gala.
Raman spoke about Schalke's determination for a better Bundesliga campaign than last season, when the team finished a disappointing 12th and his ambition to play the 2021 Euro tournament with the Belgian national team.
Monchengladbach approached Dortmund's goal dangerously for the first time in the 32nd minute when custodian Roman Burki saved Jonas Hofmann's shot from very close range.
The Blacks and Yellows have put together a squad with exceptionally talented youngsters and seem the only serious challenger.
Stage One will be played across two blocks of eight days: September 13-20 and September 28-October 5. Enditem
Al Duhail opened the scoring in the 12th minute as Abdullah Al Ahrak cut inside from the right flank and unleashed a powerful drive from 25 yards that nestled into the roof of Adel Al Hosani's net.
Lucas Oliveira put the hosts ahead with a rasping 20-yard effort that flew into the top-left corner before Keno equalized from the penalty spot after Nathan Souza was brought down by Eder Ferreira.