Britain now has two players in the womens' top 100 for the first time in 16 years - with another set to make it three.
The new world rankings, which were published by the WTA on Monday, features Melanie South as No.99 in singles - joining Anne Keothavong who is ranked at 54.
Elena Baltacha's fine run in Melbourne - where she got through qualifying and reached the second round - has pushed her up to 108.
South has been in fine form of late having reached the Medibank International second round in Sydney and having gained direct acceptance into the Australian Open main draw in Melbourne.
This followed a fantastic end to 2008 which saw the 22 year-old win a $25k title in Port Pirie and reach three further finals, two in Australia and one in India.
With Anne Keothavong at No.54, it is the first time two British females have been ranked inside the world's top 100 singles players since Jo Durie and Monique Javer on 28th March 1993.