Halep came through a tough third-round match against Polona Hercog 6-1, 4-6, 6-3. The Romanian player faced three break points and lost them all, but managed to break Hercog six times. Second-seeded Karolina Pliskova hit 24 winners in a 6-1, 6-2 victory over Elise Mertens. That set up a quarterfinal against Ekaterina Alexandrova, who progressed when her opponent Jelena Ostapenko retired with a hip injury at 3-6, 1-2 down.
Britain's Johanna Konta lost 6-3, 6-2 to Ons Jabeur of Tunisia, who will face Alize Cornet in the last eight. In the men's draw, top-seeded Guido Pella lost to Taylor Fritz 6-4, 3-6, 6-4, while second-seeded Laslo Djere was defeated 7-6 (5), 7-6 (6) by qualifier Thomas Fabbiano. Sam Querrey beat fourth-seeded Dusan Lajovic 6-2, 6-3.
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