Ashleigh Barty, the world number one, told people to "Wait and see" about her next move.
The three-time Grand Slam champion said she had given everything to tennis.
Barty said she was more interested in giving back to the community than trying another sport.
She said that she always wanted to have the time to contribute more in other ways.
That is what lights me up.
Barty said she was excited to help provide fellow Indigenous Australians with more opportunity to get into the sport from a young age.
She played in the first season of cricket's Women's Big Bash League after taking a break from tennis.
She said that she has always been an athlete and that she would see how she goes.
In January this year, Barty became the first home player in 44 years to win the Australian Open men's or women's singles title.
After her Wimbledon victory, Barty said she was thinking about retirement.
She said she had an injury after the Australian Open that had taken longer to heal than she had hoped.
Barty said she had been spoiled by the support she had received from other players.
She confirmed that she and Gary Kissik are getting married, but did not give any further details.
Craig Tyzzer said Barty's decision was not a shock.
Ash does her own thing. He said that she won the Aussie Open for everyone and that there was nothing left in the tank for her.
He said that the motivation wasn't really there after Barty won Wimbledon.
Simon Atkinson is a reporter for the British Broadcasting Corporation.
Even in retirement Ash Barty will still be hitting tennis balls, just not for the selfish reason of progressing her career.
The boys and girls will benefit from her coaching and expertise. Barty got them into the game.
I was struck by how much the young players appreciated Barty's spirit and determination as much as her famous backhand slice.
Georgia Campbell, the state's under-14 clay-court champion, excitedly recalled the time she got Barty's autograph, but said the player had also given her something more important - inspiration to train hard, never give up and have fun.
Barty wants to give particular focus to working with young Indigenous Australians and helping them fulfill their potential on and off the court. Her recent visit to communities in the Northern Territory is something she wants to do more of.
There are few complaints about the community-minded ambition of Ash Barty.
Barty held the world number one position for 114 weeks.
Steffi Graf, Serena Williams, and Martina Navratilova have all had long streaks as world number one in the women's game.
At the time of her retirement, Barty had earned over 20 million dollars in prize money, making her the highest-earning female tennis player in the world.
Her Australian Open win made her a national hero.