considered to be her weaknesses, they both improved over the years. Towards the end she was considered to be considerably faster than when she started playing professional tennis. Surfaces Ivanovic's best surface was clay, where her height allowed her to strike clean winners off high-bouncing balls. Nonetheless, she was capable of performing well on hard and grass courts as well. When she launched her re-branded site during 2010, she stated in her bio that she likes all surfaces. Rivalries Ivanovic vs. Janković Ivanovic and her fellow Serbian Jelena Janković have encountered each other 12 times with Ivanovic having the advantage 9 to 3 in match wins (including a walkover). The pair played their first match against each other in an abandoned swimming pool used as a tennis court in Belgrade. A 9-year-old Janković won the match, beating the 7-year-old Ivanovic 7–1. When asked why Ivanovic has posed such a problem for herself, Janković remarked that she struggles to read Ivanovic's game mostly due to the fact Ivanovic likes to play short points. Ivanovic leads 2–1 on clay, 6–2 on hard courts and 1–0 on carpet courts. The longest match contested between the two in the semi-finals at the East West Bank Classic in Los Angeles. In a match lasting two and a half hours, Ivanovic recovered from a 4–1 third set deficit, saving two match points en route, to defeat Janković on her way to the title. The most significant match between the pair took place in the semi-finals of the French Open, with the winner having assured of becoming world No. 1 and with both women bidding to win their first Grand Slam title. Ivanovic won the match, recovering from a 3–1 final set deficit to defeat Jankovic for the fifth consecutive time. Jankovic's win at the 2008 WTA Tour Championships in Doha later that year snapped a 5 match losing streak against her compatriot. The relationship between the pair has been strained. Both have openly admitted in the past to not liking each other and have been involved in a number of high-profile spats on and off court. Ivanovic was criticized both by Janković and her mother after Ivanovic decided to withdraw from Serbia's Fed Cup World Group play-off tie against Slovakia, citing her poor form in 2010 which left Janković the only high-profile player to play the tie which Serbia lost 3–2. During the same weekend, Ivanovic