Iga Swiatek fought back from a set down to beat Daria Kasatkina 5-7, 6-1, 6-1, keeping alive her bid for a fourth Qatar Open crown. Elena Rybakina also advanced after edging Zheng Qinwen in three sets. Victoria Mboko, Jelena Ostapenko, Karolina Muchova, and Maria Sakkari joined them in the quarter-finals, setting up a high-stakes last-eight lineup.