I Have Nothing More To Give — World No. 1 Barty Announces Shocking Retirement At 25

World No 1 Ashleigh Barty stunned the tennis world on Wednesday by announcing her retirement from the sport at the age of just 25.

Barty dropped the bombshell weeks after becoming the first home-grown champion of the Australian Open in 44 years, joining tennis royalty's most exclusive club with a Grand Slam crown on three different surfaces.

#Breaking: Ash Barty has announced her retirement from tennis aged 25 to pursue 'other dreams', just months after her Australian Open victory.

"I just know physically I have nothing more to give... I have given absolutely everything I can to this beautiful sport," Barty said. pic.twitter.com/VrQc1iGQbl

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"Today is difficult and filled with emotion for me as I announce my retirement from tennis," she said in a video posted on Instagram.

In the tearful video message with her close friend and former doubles partner Casey Dellacqua, Barty said she was "thankful for everything this sport has given me".

"I just know physically I have nothing more to give... I have given absolutely everything I can to this beautiful sport," Barty said.

Barty has been world No 1 for more than two years and retires after winning three Grand Slam singles titles – the French Open in 2019, Wimbledon in 2021 and the Australian Open this year.

"Thank you for being an incredible ambassador for this sport and for women around the world," the Women's Tennis Association tweeted. "We will miss you so much, Ash."

Widely seen as one of the most respected and loved players on tour, Barty rapidly became the best, with her dizzying array of slices, pinpoint serving and seamless forehand typifying her all-around game.

Late last year, she became engaged to long-term boyfriend Garry Kissick, who was ever-present courtside when she played and often posted supportive messages on social media.