World number 16 Belinda Bencic has pulled out of next month's Olympic Games in Rio to focus on the US Open.
The Swiss, 19, was forced to withdraw from the second round at this year's Wimbledon with a wrist injury.
"Although I have recovered from the wrist injury I am behind in my training schedule," she wrote on social media.
On Tuesday, Bencic's compatriot Roger Federer, the men's world number three, pulled out of Rio with a knee injury that has ended his 2016 season.
The US Open begins in New York on 29 August.