27 April 2019, Baden-Wuerttemberg, Stuttgart: Tennis: WTA-Tour – Stuttgart, singles, women, semi-final: Kvitova (Czech Republic) – Bertens (Netherlands). Petra Kvitova reacts. Photo: Marijan Murat/dpa, Image: 429227963, License: Rights-managed, Restrictions: GERMANY OUT, Model Release: no, Credit line: Profimedia, AFP