Barty defeated doubles partner, Julia Goerges, in the final of the Birmingham Classic to take the top ranking.
It comes just two weeks after she won her first Grand Slam at the French Open.
Ash Barty claims women's number one ranking
Ashley Barty after winning the Nature Valley Classic in Birmingham Source: AAP
Indigenous tennis star Ashleigh Barty has become Australia's first women's world number one player in 43 years.
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