"After many thoughts I have decided not to play this year's US Open," Nadal said on Twitter.
"The situation is very complicated worldwide, the COVID-19 cases are increasing, it looks like we still don't have control of it."
The 34-year-old Spanish star also took aim at the tennis schedule.
"We know that the reduced tennis calendar is barbaric this year after 4 months stopped with no play..." Nadal said.
