Li led the head-to-head 6–5. After their first four matches in 2009 and 2010 the head-to-head was even at 2–2. This included a victory each at the Wimbledon Championships; Radwańska winning in 2009 and Li in 2010. In 2012 Li and Radwańska met 4 times, with Li taking 3 victories. Li lost their meeting in the Stuttgart quarter-final in three sets, but dominated in Montréal, Cincinnati and Beijing. Li prevented Radwańska from taking the world No. 1 ranking off Victoria Azarenka with the first two victories, whilst she also ended her title defence in Beijing, securing the eighth and final place in the year-end championships in the process. In 2013 both won the first tournament they entered. They were both undefeated when they met each other in the semifinals of their second tournament of the year at Sydney. Radwańska beat Li and eventually won the tournament. This was Li's first defeat of 2013, while Radwańska remained unbeaten. In the 2013 Australian Open quarterfinals, Li handed Radwańska her first loss of the season. They met again at Wimbledon in the quarterfinals, with Radwańska eking out a close three set win. Li and Kim Clijsters formed a well-known rivalry, having met eight times between 2006 and 2012. Clijsters won their head-to-head 6–2, including 4–0 at Grand Slams. Li's maiden Grand Slam quarterfinal was at Wimbledon in 2006 in which she was defeated by the second-seeded Clijsters in straight sets. Li's second Grand Slam quarterfinal was at the 2009 US Open, and again it was against Clijsters, who had recently launched a comeback after starting a family, who prevailed in straight sets. One of Li's two wins against Clijsters came in the final of the 2011 Sydney International. Li had trailed 0–5 in the first set before coming back to win the set in a tiebreak en route to complete a remarkable straight-sets victory and deny Clijsters a third Sydney title. They would meet again only two weeks later, in the final of the 2011 Australian Open, a match which had historical proportions because Li would have become the first player from an Asian country to win a Grand Slam singles title or Clijsters would win her first non-US Open Grand Slam title. Both players came into the match having defeated the world's top two players in the semifinals: Li over Caroline Wozniacki and Clijsters over Vera Zvonareva.