Simona Halep and Madison Keys are in Singapore preparing for next week’s BNP Paribas WTA Finals Singapore presented by SC Global, where there are 1,500 ranking points on offer and a prize purse of 7,000,000. The glamourous side of tennis will be on full display in Singapore, which is why it’s important to also remember where these women have come from.

Writing for CNN.com, tennis journalist Danielle Rossingh explored the tough financial burdens placed on young players and the sacrifices their families must make to help their daughters achieve their dreams. The article certainly caught the eye of one famous tennis mom:

Only a parent knows the true cost of developing a tennis player. They r the ones who live it. https://t.co/VqDynOMmh5

— judy murray (@JudyMurray) October 18, 2016

According to CNN.com, Simona Halep, who will be playing in her third straight WTA Finals, was able to break through on the junior circuit thanks to the help of Corneliu Idu, a supportive businessman from her hometown of Constanta.

Idu, one of the wealthiest men in Constanta, was the owner of the Tenis Club Idu, where Halep played. His money helped her enter events on the European junior circuit for two years up to the age of 16.

“That was it, I didn’t have any other sponsors,” said Halep, now 25. “My parents did their best to get me to where I am today, but it was good for us we had that help.”

Madison Keys has qualified for her first WTA Finals, after becoming the first American to make her Top 10 debut since Serena Williams in 1999.

Keys vividly remembers the sacrifices that were made for her tennis career, including uprooting the entire family including three siblings to Florida from Minnesota so she could enroll in the Evert Tennis Academy at the age of 10.

“It was not an easy decision,” the seventh-ranked Keys said in an interview in Wuhan. “My mom did not want me living in a dorm. My mom was like, ‘I don’t want a 15-year-old raising my 10-year-old.’ It was tough for my sisters and it was tough for my mum. She left a job that she really enjoyed doing, and my sisters obviously had been going to school.”

Read the full article on the cost of raising a tennis champion at CNN.com here.