In the tearful video message with her close friend and former doubles partner Casey Dellacqua, Ashleigh Barty said she was "thankful for everything this sport has given me"
Barty has been world number one for more than two years and retires after winning three Grand Slam singles titles
World tennis No.1 Ashleigh Barty won the French Open in 2019, Wimbledon in 2021 and the Australian Open this year.