Martina Hingis and her husband Harald Leemann welcomed a baby girl, Lia, on Friday.

“And then we were three,” she wrote on Twitter. “Harry and I are excited to welcome our baby girl Lia to the world. We are already so in love.”

The five-time Grand Slam champion joins a growing group of active and recently retired mothers on the WTA tour, which includes Victoria Azarenka, Casey Dellacqua, Elena Vesnina and Serena Williams.