"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.
Elsewhere, Belarus' fifth seed Aryna Sabalenka lost to compatriot Victoria Azarenka 6-1, 6-3, ninth seed Johanna Konta of Britain was stunned by Romania's Sorana Cirstea 2-6, 7-6 (5), 6-4 and tenth seed Garbine Muguruza from Spain lost to Bulgaria's Tsvetana Pironkova 7-5, 6-3.
"But like I said, I do my best and I try to help the team, I try to score as much as I can. I know how to deal with pressure," Onuegbu said.
"In accordance with the Grand Slam rulebook, following his actions of intentionally hitting a ball dangerously or recklessly within the court or hitting a ball with negligent disregard of the consequences, the US Open tournament referee defaulted Novak Djokovic from the 2020 US Open," the statement said.
Elsewhere, Belgium's Elise Mertens upset second seed Sofia Kenin of the United States 6-3, 6-3 to also make the last eight.
QUITO, Sept. 7 (Xinhua) -- Ecuador head coach Gustavo Alfaro said Monday he feels obliged to guide Ecuador to the 2022 FIFA World Cup in Qatar, despite the team's recent run of mediocre form.
In the 69th minute, the Shenzhen side got another goal-scoring opportunity. However, Harold Preciado's close-range shot was saved by Shenhua goalkeeper Zeng Cheng and then John Mary's follow-up header hit the woodwork once again.
Meanwhile, in the women's 1,500 metres, reigning Olympic champion Faith Kipyegon will take on 2016 Rio Olympics runner-up Genzebe Dibaba in the Czech Republic. Enditem
Coates said the Games will start as planned on July 23 "with or without COVID-19," stressing the Olympics has never been cancelled outside of world wars.
PARIS, Sept. 5 (Xinhua) -- Britain's Adam Yates retained the yellow jersey of the 2020 Tour de France after an arduous stage 8 on Saturday, as local rookie rider Nans Peters won the stage.
Kosgei was later disqualified for infringement after she was found to have stepped on the rail.