of Denmark is now the new world number 1 on the WTA tour rankings and that will be reflected in the world rankings from next week.
Wozniacki however has not reached a Grand Slam final this year and she recently lost in the US Open Semi final in straight sets to the Russian Vera Zvonareva.
Serena Williams of the USA has up until now been the world number 1 for the whole of the 2010 she won her 5th Australian Open title in Melbourne at the start of the year when she beat the former world number 1.
Serena also won a 4th Wimbledon title this summer when she beat the Russian Vera Zvonareva in the final in straight sets.
Zvonareva also made the US Open final this summer in Flushing Meadows New York but she lost in straight sets to Kim Clijsters of Belgium it was a 3rd Open title for Clisjters.