(Reuters) -Two-time Wimbledon champion Petra Kvitova announced on Thursday that she will retire from tennis at the conclusion of the U.S. Open later this year. The Czech returned to competition this year after a 15-month maternity break.

Petra Kvitová, the two-time Wimbledon champion and former world No. 2, has announced she will retire after this year’s U.S. Open. Kvitová, 35, won the Billie Jean King Cup six times with the Czech Republic and has 31 singles titles to her name.

Kvitova made her return to the WTA Tour in Austin, Texas, in February after 17 months away from the court and is currently ranked 572nd. Wimbledon begins June 30.