(Reuters) - World number eight Tomas Berdych of the Czech Republic has pulled out of the U.S. Open after suffering an appendicitis, he said on Saturday.
"I am very disappointed to announce I will not be able to compete at the U.S. Open this year," the 30-year-old wrote on Twitter.
"I was just diagnosed with Appendicitis in Cincinnati so I will be flying back to Europe for additional checks and treatment," he added.
"I will need to take some time off to recover fully but I know I will get back as strong as ever."
Berdych, who lost in this year's Wimbledon semi-finals to eventual champion Andy Murray, pulled out of the Rio Olympic Games due to fears over the Zika virus.
The U.S. Open starts on Aug. 29.