Sara Errani earned her first Grand Slam finals appearance with a three-set victory Thursday over sixth-seeded Samantha Stosur. Errani, seeded No. 21, finished off a 7-5, 1-6, 6-3 victory over Stosur with a forehand winner. It was her second win over a Top 10 player in two matches after losing her first 28 matches to highly ranked players. She\'d never advanced beyond a Grand Slam quarterfinal before this week. She will go against either second-seeded Maria Sharapova or No. 4 Petra Kvitova in Saturday\'s women\'s singles final. Sharapova and Kvitova were to play later Thursday. Sharapova will take over the world No. 1 ranking with a win over Kvitova and would complete her personal Grand Slam with a French Open championship. Kvitova, who beat Sharapova in the finals at Wimbledon last year, is seeking her second major tournament title. Stosur was 5-0 lifetime versus Errani and hadn\'t dropped a set heading into the semifinals but Errani ended the set-win string with a break in the 11th game of the first set and then held for the lead. Stosur seemed to find her game and went out 5-0 in the second set. But Errani posted an early third-set break and got in position to win for her fourth break of the day that was worth a 5-3 lead. Errani will be looking for a French Open double as she and Italian countrywoman Roberta Vinci have already reached Friday\'s women\'s doubles final against Russians Maria Kirilenko and Nadia Petrova.