Romanian Halep, beaten finalist at last month's French Open, has climbed to third in the rankings this year by virtue of career-best results at consecutive grand slams and was in no mood to ease up against the 19th-seeded German.
Lisicki had shrugged off a shoulder injury in her fourth-round victory over Yaroslava Shvedova on Tuesday with no apparent ill-effects and went on the attack with some big serves and ferocious groundstrokes to race into a 4-1 lead.
But Halep showed her mettle to pull back to 4-4. Lisicki seemed to sense she had missed a golden opportunity, allowing the Romanian to give her the runaround from the baseline and reel off the next eight games to seal a place in the last four.
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