Top-ranked Victoria Azarenka needed nearly three hours to overcome big-serving wild card Mona Barthel 6-4, 6-7 (3), 7-5 for a place in the Porsche Grand Prix semi-finals on Friday. Second-ranked Maria Sharapova was on court for an even longer period, rallying to outlast No. 5 Sam Stosur of Australia 6-7 (5), 7-6 (5), 7-5 in...
