Reguilon broke into the Real Madrid first team in the 2018-19 season, making 22 appearances and moving ahead of the Brazilian left back Marcelo in the pecking order.
Al-Taawoun will face Persepolis again on Friday.
Despite the lack of any games for nearly six months due to the COVID-19 pandemic, Iran has been moved three places up to be positioned 30th by the FIFA.
Last season's top scorer Pierre-Emerick Aubameyang completed the scoring ten minutes later, finishing off a fine team goal by curling home from Willian's assist.
Although Madrid did substitute that league game with a friendly against Getafe, which they won 6-0, that remains their only match ahead of the new season, making it hard to draw conclusions over the match fitness of Zidane's men.
Nishikori needed six match points to seal the win in two hours at the ATP Masters event held behind closed doors at the Foro Italico.
But just when it appeared as if Leeds would take a well-deserved point back to West Yorkshire, a loose challenge from record signing Rodrigo resulted in another penalty which Salah tucked away with unerring accuracy.
Christian Bassogog tapped in a late goal for Jianye but that couldn't alter the outcome.
According to the latest rule, the total salary for domestic players should stay between 20 million RMB (about 2,960,000 US dollars) and 44 million RMB (about 6,512,000 US dollars). After the conclusion of the season, the league will reassess the pay structure. Any amount over 44 million RMB or below 20 million RMB will be charged a luxury tax of 25 percent.
Every Bayern player has to forget his ego and act smartly as everyone will need a break now, he added. "Success is all about the players' contribution to the team."
Li Ang netted a right-sided free-kick on 74 minutes to put the game beyond doubt, with a sweet finish for Suning.