Siegemund made her return to the WTA Tour in April at the Charleston Open where she lost in the second round to tenth seed Naomi Osaka. At the Ladies Open Lugano, she retired during her first-round match against Kathinka von Deichmann. Siegemund received a wildcard to compete at the Porsche Tennis Grand Prix as the defending champion. In the first round, she beat Barbora Strýcová but was defeated in round two by eventual finalist CoCo Vandeweghe.
