Barty dropped the bombshell weeks after becoming the first home Australian Open champion in 44 years and so winning a Grand Slam crown on three different surfaces.
In a tearful social media video message with her close friend and former doubles partner Casey Dellacqua, Barty said she was "so ready" to call it quits after achieving her life-time ambition to win Wimbledon last year.
"Success for me is knowing that I've given absolutely everything, everything I can. I'm fulfilled, I'm happy and I know how much work it takes to bring the best out of yourself," said the three-time Grand Slam winner.
"It's just I don't have that in me anymore. I don't have the physical drive, the emotional want and kind of everything it takes to challenge yourself at the very top level anymore.
"I think I just know that I'm absolutely, I am spent. I just know physically I had nothing more to give and that for me is success."
One of the most respected and loved players on tour, Barty also became the best -- with her dizzying array of slices, pinpoint serving and seamless forehand typifying her all-round game.
Few athletes can boast such a varied sporting resume as the down-to-earth Australian.
She began playing tennis as a child in the Queensland state capital Brisbane and went on to win the junior Wimbledon title as a 15-year-old in 2011.
But the expectations that came with success took their toll and she made a shock decision three years later to ditch tennis for cricket, signing for Brisbane Heat in the inaugural Women's Big Bash League.
Dream come true But the lure of tennis was never far away and she returned after a season out, breaking through for her maiden Grand Slam triumph at the French Open in 2019 and
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