Simona Halep stunned in Stuttgart while Caroline Wozniacki suffers injury blow

Coco Vanderweghe stunned world number one Simona Halep to move into the Stuttgart semi-finals.

Vanderweghe, a former US Open semi-finalist who has publicly claimed she does not like clay, powered to a 6-4 6-1 win over Halep to earn a clash with Caroline Garcia – who overcame Elina Svitolina in her quarter-final – in the last four.

“At one point in the first set, I wasn’t even sure of the score,” Vandeweghe said. “Maybe that’s the secret.”

“Clay is still not my favourite surface, it’s certainly not my number one.”

World number two didn’t have much luck either after an abdominal injury forced her to retire from her Istanbul Cup quarter-final against Pauline Parmentier.

Unseeded Parmentier will now face seventh seed Irina-Camelia Begu of Romania who saw off Donna Vekic of Croatia 3-6, 7-6 (7/1), 6-1.

In Saturday’s other semi-final, Polona Hercog of Slovenia faces Greece’s Maria Sakkari.