Fiorentina loanee Pedro put the visitors ahead in just the second minute by pouncing on an errant pass and sliding home from close range.
Fourth seed Naomi Osaka of Japan booked her place in the third round with a comfortable 6-1, 6-2 win over Italy's Camila Giorgi.
Klein is expecting the many young talents to continue their performance. He mentioned Dortmund's Erling Haaland as one of the examples next to Jadon Sancho.
"It was a delight to wear yellow. Hopefully I'll keep for a few more days. Let's first see how it goes tomorrow."
Meanwhile United coach Ole Gunnar Solskjaer commented that he was pleased with what the talented playmaker could bring to his team.
"The Premier League confirms that it has today terminated its agreements for Premier League coverage in China with its license in that territory, the Premier League will not be commenting further on the matter at this stage," read a statement.
By winning the cup, the Tabriz-based team will directly participate in next year's AFC Champions League. Enditem
Iran sit third, behind Iraq and Bahrain, in Group C of the 2022 FIFA World Cup Asian Zone qualification. Enditem
Klein called safeguarding the club's financial pattern more important than ever for the future of football.
The fact that three German coaches made it to the Champions League semifinals tells the story of a successful coaching education system, he underlined.
The 54-year-old Dane announced he has been receiving medical treatment for the condition after being diagnosed some years ago and, with the assistance of doctors, has continued to carry out his duties as BWF president "without limitation," said the world governing body.