The Belgian told the WTA Insider Podcast: "I don't really feel like I want to prove something".
"Driven by her love for the sport, this wonderful champion continues to inspire women and men in all walks of life - and she only adds to the compelling wealth of talent in women's tennis. And honestly I miss that feeling", she said on Twitter.
After retiring to dedicate her time to parenthood, Kim Clijsters plans to compete in professional tennis again in 2020. I was very young when I retired to have my first daughter and came back. "See you in 2020". She returned to the No.1 spot in the world on February 14, 2011.
Kim Clijsters is giving tennis another go.
Clijsters made her WTA debut at 15, and hasn't played a competitive match since she was 29. 4 years later, she turned world No. 1 in each singles and doubles, the primary Belgian to attain both honour. Despite her lengthy time out she still ranks third among active players in terms of tournament success behind the Williams sisters - Serena with 72 titles and Venus with 49. Roddick won the 2003 US Open title reached three Wimbledon finals, losing to Roger Federer all three times.
"While there is a lot of work ahead of me in the next four months, my biggest motivation is the personal challenge involved - both physically and mentally, I want to test myself again", Clijsters said in a press release.
"Could I be a loving mom to my three kids and the best tennis player I can possibly be?"
Clijsters, who has won 41 singles titles in her career, is eligible for unlimited wildcards at WTA tournaments and will need to play three tournaments or earn 10 ranking points to re-establish a ranking. Murray is aiming to rebuild his singles ranking following the operation in January.
"These last few months have been tough", she said.
"If I want to be able to compete with these girls, I'm going to have to be the fittest that I ever have been and to be able to move like I did in the past". We had good crowds there and it was different. 'Me, too.' I'm 36 years old.
"I am just happy to be healthy again". I still love playing tennis.
I want to feel like I'm getting to where I want to be. American Alison Riske, who knocked out Angelique Kerber in the first round, takes on home favourite Zheng Saisai.