Women's tennis world number three Karolina Pliskova said Friday she was pulling out of next week's Ostrava Open because of a wrist injury.

The 29-year-old Czech player was set to be the top seed at the WTA tournament played in the eastern Czech city of Ostrava on September 20-26. 

"It is not really easy to excuse myself from a tournament played before an audience and at home," said Pliskova, who reached the Wimbledon finals and the US Open quarter-finals this year.

Her doctor said the injury had been apparent for a while. 

"Problems with the wrist appeared even before the US Open, and they could not be treated adequately as she advanced in the tournament," Radek Kebrle said in a statement.

"Since the problem got worse, we have agreed on a three-week break from tournaments," he added.

Pliskova's withdrawal leaves Ukraine's world number four Elina Svitolina as the top ranked player in the tournament.