Ash Barty, world's top-ranked women's tennis player, announces retirement at age 25

Ash Barty surprisingly retired from tennis at age 25 while ranked No. 1 and less than two months after winning the Australian Open for her third Grand Slam singles title.

"I'm so happy and I'm so ready. I just know at the moment, in my heart, for me as a person, this is right," Barty said, her voice shaky at times, during a six-minute video posted on her Instagram account Wednesday in Australia.

Saying it was time to "chase other dreams," Barty said she no longer feels compelled to do what she knows is required to be the best she can be at tennis.