It takes a dedicated person to return to the sporting field after enjoying the comforts of retirement.
Usually, there is not a lot to prove following a career filled with great achievements.
While some do it for financial reasons, others miss the competition or camaraderie of the professional game.
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In a sport like tennis, there are options for retirees.
They can enjoy the relaxed nature of veteran-only events at Grand Slams or World Team Tennis events.
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However, for former world number one Martina Hingis, her love of the sport and will to experience more success has lured her back to the WTA tour.
After returning to the sport in 2013, Hingis has steadily edged towards to the elite level.
She recently reclaimed her world number one doubles ranking, 18 years after doing so for the first time.
Alongside her partner Sania Mirza from India, Hingis won the Australian Open doubles final by defeating the Czech pair of Lucy Hradreca and Andrea Hlavackova 7-6 6-3.
The win marked their third consecutive Grand slam title after winning Wimbledon and the US Open in 2015, while extending their overall winning streak to 36 matches.
Hingis, 35, has previously retired from the game twice, first voluntarily in 2002 and then again in 2007 when she was suspended for two years after being found guilty of having benzoylecgonine (a metabolite of cocaine) in her system.
Speaking about her second comeback to tennis, Hingis has said it's all about proving she can still compete.
"My nature is to win. When I first started it was like, OK am I ready enough, am I good enough? That's what really got me back.
"I wouldn't do it if I felt I didn't have the game," .
Despite being in a more relaxed frame of mind now that her singles days are behind her, Hingis says she doesn't take these performances lightly.
"This is still part of my career. People pay attention, I consider myself fortunate to be in this position."
Hingis last year claimed she has more time to sit back and admire the game of tennis.
"Playing tennis makes me feel comfortable. It's like I am part of a family. It's a great life, we get to travel around like we are on holiday the whole year round," the Czechoslovakian-born Swiss said.
She is also aiding the development of promising compatriot Belinda Bencic, who is currently ranked 13th in the world.
Bencic is coached by Hingis' mother Melanie Molitor.
"Whenever I get the chance to watch her and be there for her I am," the 35-year-old said.
With support like that in Bencic's corner, you can expect her to achieve great things in her career.
While we will never see Hingis grace the singles courts again, tennis lovers can rejoice in the fact she hasn't removed herself from the game entirely.
Long may her reign as queen of the doubles circuit continue.
Are Hingis and Mirza the greatest womens doubles partnership of all-time? Give YOUR opinion in the comment box below!