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Caroline Wozniacki, 29, rocked the tennis world on Friday when she announced she is retiring from tennis to start a family with husband David Lee.

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Wozniacki and Lee are pictured on holiday in Venice in 2017. The former world No. 1 tennis champion announced her retirement in a lengthy post on Instagram. The unselfish star told her followers "there is a lot more in life that I'd like to accomplish off the court."

"I've played professionally since I was 15 years old. In that time, I've experienced an amazing first chapter of my life. With 30 WTA singles titles, a world #1 ranking for 71 weeks, a WTA Finals victory, 3 Olympics, including carrying the flag for my native Denmark, and winning the 2018 Australian Open Grand slam championship, I've accomplished everything I could ever dream of on the court."

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Wozniacki probably realizes she only has a handful of years to carry healthy babies to term without going the IVF route.

"I've always told myself, when the time comes, that there are things away from tennis that I want to do more, then it's time to be done. In recent months, I've realized that there is a lot more in life that I’d like to accomplish off the court. Getting married to David [Lee] was one of those goals and starting a family with him while continuing to travel the world and helping raise awareness about rheumatoid arthritis (project upcoming) are all passions of mine moving forward."

Doctors urge women to get pregnant before age 35 to avoid increased risk of birth defects or genetic defects.

According to the National Institutes of Health, if a woman gets pregnant at age 25, the risk of having a baby with Down syndrome is about 1 in 1,250. At age 40, the risk is 1 in 100.