British number one Cameron Norrie will not compete at the Japan Open after testing positive for Covid-19 while competing in Korea.
Norrie is pushing for a place at the season-ending ATP Finals in Turin.
"Unfortunately, I had a positive Covid test in Korea and wasn't able to compete in the rest of my matches," Norrie wrote on Instagram.
"I have no symptoms and I am feeling 100% fine.
"I was really hoping to go to Tokyo but because of the quarantine period I will not be able to play there."
World number eight Norrie, who has won two titles this year and reached the top 10 for the first time, was due to face Australia's Thanasi Kokkinakis at the Japan Open on Monday.