Kvitova, Sakkari, Swiatek, Kontaveit all in Ostrava Open semis

Top-seeded Iga Swiatek of Poland advanced to the semifinals of the Ostrava Open after beating seventh-seeded Elena Rybakina of Kazakhstan. This happens to be her first semifinals since winning in Rome in May to set up a match against fourth-seeded Maria Sakkari. The Greek overcame Czech Tereza Martincova 7-5, 6-3 in the quarterfinals. Sakkari will…