French Open 2013: Serena Williams forced to fight back against Svetlana Kuznetsova to claim place in semi-finals The Russian, who has always given Williams a tough time, changed her game plan to focus more on variety and cut out the errors, and it worked. Having not dropped serve all tournament, the world number one promptly gave it away three times in succession, appearing to tighten up as pressure was applied for the first time this fortnight. Williams was screaming at herself but she fought back from 5-1 to 5-3, only for Kuznetsova to save five break points and level the match. The drop shot was working particularly well for Kuznetsova and it helped her take her first set point. The momentum was with the Russian and Williams' title ambitions were in serious jeopardy when she lost the first two games of the third set as well. The top seed knew it was now or never, and she needed all her fighting skills to save three break points in the next game. Kuznetsova finished the final point on the clay and, although she was still ahead, everyone on Court Suzanne Lenglen knew it was a big moment. Williams promptly levelled at 2-2 and then extended her run of successive games to five. Kuznetsova forced her to serve it out but by now the American was confident and she wrapped up victory with a forehand drive volley. Williams showed just what the victory meant to her, throwing her hands in the air and letting out a huge scream. Next the American will play last year's runner-up, Sara Errani, who knocked out fourth seed Agnieszka Radwanska for her first ever win over a top-five opponent at the 29th attempt. It was only here last year, when she eventually lost to Maria Sharapova, that the Italian beat a top-10 player for the first time, and she has gone from strength to strength. Her match against Radwanska was a contrast to the other quarter-final happening across Roland Garros, with guile and touch the order of the day rather than power. It was tight all the way through but Errani was always the player forging ahead and, although she could not serve out victory in the second set, she came through on a tie-break to win 6-4, 7-6 (8/6).