Tennis world number one Ashleigh Barty wants to remain closely associated with the sport even after her surprising resignation.

"I will never stop loving the sport and I will never stop hitting tennis balls," the 25-year-old Australian said in Brisbane on Thursday.

"Only I'm just not going to do it selfishly anymore to try and advance my career."

The Australian Open winner unexpectedly announced the end of her career to the public on Wednesday.

She's looking forward to coaching youngsters and "making a contribution," Barty said.

"I can't wait to teach my nieces and nephews and I hope they will love tennis as much as I do."

In the future, she wants to spend more time with her family.

"I've always been a domestic person, so that's how I recharge my batteries, that's how I draw my energy." Barty has been engaged to professional golfer Garry Kissick for the past year.

"This is a new chapter for Garry and I and it's going to be a lot of fun," she said.

She left it open whether she wanted to try other sports in the future.

At the age of 18 she had already put her career on hold for almost two years due to the pressure and too much travel and played cricket professionally during the break.

"I've always been an athlete in the sense that I've tried different things," Barty said.

"We'll see what happens."

The right-hander, who was born in Ipswich near Brisbane, has been at the top of the world rankings for 114 weeks.

Only three players have had a longer streak than her: Steffi Graf (186), Serena Williams (186) and Martina Navratilova (156).

At the end of January, Barty ensured a home triumph in Melbourne for the first time since 1978.

In total, she has won three Grand Slams in her career.

Before the Australian Open, she had already won Wimbledon and the French Open.

"I wouldn't change anything and I have no regrets," concluded Barty.

One day after her resignation, she also announced that she would have her name removed from the world rankings.

This opens up the short-term opportunity for the Pole Iga Swiatek to jump to the top of the ranking for the first time.

Barty has led the field for more than two years and holds a comfortable lead of 2204 points, but announced her retirement from top-flight tennis on Wednesday.

"My name will be deleted from the next ranking," said the 25-year-old: "It will be an exciting time for the WTA tour with a new number one." The next world ranking will be next Monday after the end of the WTA tournament in Miami published Behind Swiatek (5776 points), French Open winner of 2020, lurk the Greek Maria Sakkari (5085) and the Czech Barbora Krejcikova (5033).