By Ros Satar, in Stuttgart Angelique Kerber def. Petra Kvitova 6-3 6-3 Simona Halep [1] def. Magdalena Rybarikova 4-6 6-2 6-3 STUTTGART, GERMANY – Two time champion Angelique Kerber roared into the Porsche Tennis Grand Prix, while World No. 1 Simona Halep had to hustle into the quarter-finals.     Angelique Kerber def. Petra Kvitova 6-3 6-3 Two-time champion Angelique Kerber brought the curtain down on the first round in fine style, avenging her defeat at the weekend in the … Continue reading Kerber cruises, Halep hustles into Porsche Tennis second round