SaturdayAt Porsche-ArenaStuttgart, GermanyPurse: $731,000 (Premier)Surface: Clay-IndoorSinglesSemifinalsCaroline Wozniacki (4), Denmark, def. Simona Halep (2), Romania, 7-5, 5-7, 6-2. Angelique Kerber, Germany, def. Madison Brengle, United States, 6-3, 6-1. MORE