(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.

Kvitova, who won her two major titles at Wimbledon in 2011 and 2014, will hang up her racquet at the end of the year

Petra Kvitova is returning to Wimbledon after the 2011 and 2014 champion was awarded a wild card Wednesday for this year’s tournament