The Austrian will now challenge 2014 champion Marin Cilic of Croatia in the third round. Thiem has a 2-0 lead in their head-to-head series.
"As a result of the increase in the number of COVID-19 cases in Hungary, the Hungarian Government has introduced entry restrictions that make it now impossible for foreigners to enter Hungary. Foreigners will only be allowed to enter Hungary in the case that it is highly necessary," the organizers notified participants.
Thailand joins Chinese Taipei and Australia as member associations unable to take their place. Replacement teams have yet to be announced, the BWF said.
"I'm very happy to play a tough game with such wonderful shuttler. I was not cautious enough today and I felt nervous on some key points. But generally I think I performed well," said Chen.
The striker argued that a clause in his contract, which is due to expire in June 2021, allowed him to leave on a free transfer at the end of the 2019/20 season and that he wanted to take up the option.
National teammate Zhang Yaoguang finished second at 8.23m, followed by Asian Games champion Wang Jianan at 8.08m.
Leon are now a point clear of second-placed Cruz Azul, who will have the chance to regain top spot when they visit Atlas on Saturday.
He said he was looking forward to battling for his place alongside players such as Paul Pogba, Bruno Fernandes, Nemanja Matic and Fred.
International table tennis action has been suspended for half a year due to the COVID-19 pandemic.
Marcelo remains in support as left-back, presuming that Madrid decide to cash in on Sergio Reguilon, while Alvaro Odriozola's return from loan should offer support to Carvajal.
"The decision was made I think by the supervisors, and as I said, they are just doing their job. There is nothing much I can say to that. I'm a little bit in shock right now, to be honest."