Barty cast friendship aside to down her German doubles partner Julia Goerges 6-3 7-5 in Sunday's final of the Birmingham Classic to not only secure the world No.1 ranking but also top-seeding status for Wimbledon starting on July 1.
Continuing her remarkable comeback to the sport, after taking a 21-month hiatus and playing professional cricket, 23-year-old Barty will overtake Japanese sensation Naomi Osaka when the new rankings are released.
In doing so, the newly crowned French Open championwill join her mentor and Indigenous idol Evonne Goolagong Cawley as only the second Australian to top the WTA rankings since they were introduced in 1973.
A seven-times grand slam champion, Goolagong Cawley reached No.1 for a fortnight in 1976.
John Newcombe, Patrick Rafter and Lleyton Hewitt, who enjoyed 80 weeks at the summit between 2001 and 2003, are the only other Australians to have been world No.1.
Barty is the 27th woman to top the rankings - and the fourth-youngest in a decade.
With just five defeats in almost eight months and a tour-topping 36 wins already this year, Barty's ascension to the top is nothing but deserved.
Making a seamless transition from clay to grass, the Queenslander didn't drop a set in five matches in Birmingham.
Barty will head to Eastbourne on Monday for her last Wimbledon lead-up event riding a 12-match winning streak.
She also failed to surrender a set in her opening two doubles matches in Birmingham with Goerges before withdrawing from their scheduled semi-final to conserve energy for singles.
Merciless in her pursuit of more historic honours, Barty crunched nine aces, broke Goerges three times and dropped serve just once in clinching her sixth career title with victory over the world No.19.
Barty trailed 3-0 in the second set but, once again showing her champion qualities, she fought back in typically unflappable fashion, saving a set point at 5-4 down with her seventh ace before eventually prevailing after one hour and 28 minutes.
