World number one Simona Halep has pulled out of her final tournament before the US Open because of an Achilles injury.
The Romanian, 26, will be replaced in the Connecticut Open by Switzerland's Belinda Bencic.
"I feel very sore and I need some rest. I had so many matches in the last two weeks, so it's tough," she said.
The US Open at Flushing Meadows in New York starts on 27 August.
Halep's best run in the tournament came in 2015 when, seeded second, she suffered a shock defeat by Flavia Pennetta in the semi-finals.