For the first time in history, all Top 10 players in the WTA singles rankings are from different countries. As for continents, four of them are represented, with Europe being dominant, and Australia, Asia and North America all having one representative. We are having Denmark, Belgium, Russia, Italy, Australia, United States of America, China, Serbia, Belarus, and Poland.
These post-Australian Open 2011 rankings are significantly different from the ones preceding the tournament. Only three Top 10 players haven't changed their positions: Wozniacki is still No.1, Jelena Jankovic stayed at No.8 and Victoria Azarenka at No.9.
Serena Williams, who missed the Grand Slam, fell from No.4 to No. 12. Li Na’s Australian Open runner-up position led her to a new career-high of No.7, while champion Kim Clijsters returned to No.2 for the first time since August 2006. Francesca Schiavone reached her all-time best of No.4, which is also the highest ranking ever for an Italian women's tennis player. Agnieszka Radwanska returned to the elite 10.
Other big movement I thought worth mentioning; Petra Kvitova, Anastasija Sevastova, Shuai Peng, Zheng Jie, Alize Cornet, Monica Nuclescu, Chennelle Scheepers, Rebecca Marino and Anne Keothavong who all has significant ranking increases or decreases thanks to results from the Australian Open.
Another interesting mention is Dinara Safina who about a year and a half ago was world number one, now ranked 117th in the world!
Source - Women's Tennis Blog.