Thanasi Kokkinakis has withdrawn from the U.S. Open after injuring his pectoral muscle during a training session.
The 20-year-old Australian has played only one event this season due to a shoulder injury. Returning to competition at the Olympics, he fell in the first round and also picked up a stomach illness. He resumed training, only to experience a muscle pull.
However, Rick Montz, his agent, told *The Sydney Morning Herald* that Kokkinakis' shoulder held up in his first event since coming back.
"Thanasi played well enough at the Olympics to know that his shoulder's not really a problem,” he said. “So I think the biggest benefit of being down there, for him, was it just really motivated him, because obviously he was down. And you go through all these emotions, and he'd set that as a target. [He] went down there, hit the target and played all right, and [his] shoulder was 100 percent.”
Kokkinakis is expected to stay off the court for another two weeks.