The win puts Kenin into the third round at the US Open for the fourth year in a row. The American has come up short against top players like Maria Sharapova (2017), Karolina Pliskova (2018) and Madison Keys (2019) at this stage in the past.
On October 12, Dragan Skocic's men will host Tajikistan in the Iranian capital Tehran.
"I don't think I have ever gotten defaulted yet in my career or in my life. No, I haven't been in a situation like that. But as I said, it's very unlucky, very unfortunate," Zverev added.
"I have to explain my philosophy to my players, but it is not possible without playing football. This is a key issue that needs to be taken into consideration," Skocic said.
Zall leveled three minutes later when Cote d'Ivoire striker Jean Evrard Kouassi netted a close-range header.
"It's going to be one of the young guys, I think, if you count Dominic Thiem as a young guy, as well. He obviously has a chance to win. Now I think it is the time where it gets really interesting. We'll see where we go from here," added the German.
"I think the supervisors are just doing their job, but very unlucky for Novak," said Zverev, who reached the quarterfinals by winning on Sunday. "If it would have landed anywhere else, he would have been fine."
The midfielder then posted a message to fans on social media as he prepared to undergo surgery to repair his ACL.
"Right now I'm really focused on the US Open, and nothing else I can think about right now," said Williams, who has won six of her 23 Grand Slam singles titles at the US Open.
LONDON, Sept. 8 (Xinhua) -- Cristiano Ronaldo made history in Portugal's 2-0 win over Sweden, as the legendary footballer became the first European to reach 100 international goals with the first of his two goals in the UEFA Nations League on Tuesday.
This February, Rojas set a world indoor record of 15.43m in Madrid, beating the previous mark of 15.36m held by Russia's Tatiana Lebedeva. Enditem