Defending champion Justine Henin secured a place in the semi-finals and Ana Ivanovic moved closer to the last four after both won at the Sony Ericsson Championships on Wednesday.Former champion Serena Williams retired with a left knee injury in her opener after losing the first set to Anna Chakvetadze of Russia 6-4, and immediately went to a hospital.Top-ranked Henin beat third-ranked Jelena Jankovic 6-2, 6-2 and, with Williams’ retirement, advanced to the last four for a third straight time. Ivanovic earned her second win and eliminated Daniela Hantuchova 6-2, 7-6 (9).Henin broke Jankovic six times to win her 22nd successive match, and improve to 9-0 against the Serb. “From the first point to the end, I took all of my chances,” Henin said. “It was her first match, so maybe I had a little advantage because I played last night.”Henin broke in the first game, Jankovic leveled at 2-2, but the Belgian came to the net to break twice more to close out the first set against the first-time qualifier.Although Jankovic had moments in the second set, Henin broke in the first and third games, and improved to 11-1 indoors this year. “I couldn’t really find my game at all, I couldn’t really do anything,” Jankovic said. “So many things wrong. I have to somehow stay positive because I’m still in the game.”On Thursday, 2004 champ Maria Sharapova can clinch her and Ivanovic’s place in the semis with a victory over Kuznetsova, while Jankovic plays Chakvetadze.
