Second-seeded Lucie Safarova and fourth-seeded Sam Stosur advanced to the Prague Open final. Safarova defeated the defending champion Karolina Pliskova, 6-4, 7-6 (4). Stosur, who has eight career titles, advanced on a walkover after top-seeded Svetlana Kuznetsova could not play their semifinal because of an abdominal muscle problem.
u25a0 Alexander Zverev upset top-seeded David Goffin, 6-3, 4-6, 6-3, to reach the BMW Open semifinals in Munich. Fourth-seeded Philipp Kohlschreiber advanced to the other semifinal with a 6-4, 6-1 defeat of the wild card Juan Martín del Potro.
u25a0 Second-seeded Grigor Dimitrov beat sixth-seeded Jiri Vesely, 7-6 (1), 6-1, to reach the semifinals of the Istanbul Open.