Donskoy has recently tested positive for COVID-19 and won't be able to play the ATP Cup, which begins Jan. 1, Ravi Ubha of CNN.com
Donskoy joins his fellow teammates from Team Russia of Andrey Rublev
and Aslan Karatsev
who recently tested positive for COVID-19 and will no longer be able to participate at the ATP Cup. Given Donskoy's current singles ranking of No. 172, it's unclear on when his next singles event will occur even when he's healthy.