Siniakova grabs career-best win over Halep

World No. 4 Simona Halep was a big-name casualty in Wednesday's Shenzhen Open action, losing in three sets to Katerina Siniakova.

Halep - cropped

Simona Halep won the Shenzhen Open in 2015.

World No. 4 Simona Halep was a big-name casualty in Wednesday's Shenzhen Open action, losing in three sets to Katerina Siniakova.

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Halep, the champion in Shenzhen in 2015, had got her season under way with a three-set win over former World No. 1 Jelena Jankovic.

But the second seed came undone on Wednesday, going down 6-3, 4-6, 7-5 to Siniakova — who picked up the first top-10 victory of her career. Nina Stojanovic is Siniakova's quarter-final opponent after the Serbian qualifier beat Ons Jabeur 4-6, 6-3, 6-3.

With Halep's elimination, the bottom half of the draw could now open up for either Johanna Konta or Karolina Pliskova, who booked a quarterfinal against the Briton with a 6-1 6-2 thrashing of Chang Kai-chen of Chinese Taipei.

Camila Giorgi beat Chinese number four Zheng Saisai 6-7 (5-7), 7-5, 6-4 to book a last-eight meeting with the host nation's second-highest ranked player Wang Qiang.