PARIS – Samantha Stosur of Australia started strong, pounding the ball from corner to corner and running top-seeded Serena Williams to distraction, but Williams, smacking aces at key moments, would not yield. Their quarterfinal French Open duel lurched forward as a contest of will and power. In the end, it was Stosur who prevailed in a fiercely fought 6-2, 6-7 (2), 8-6 victory to advance to the semifinals. Stosur’s two remarkable crosscourt passing shots — a forehand and a backhand, both on the run — led to her final push, breaking Williams’s serve and stepping her into the lead, 7-6,...