Caroline Wozniacki tells the Telegraph that she thinks that tennis players are underpaid in comparison to other athletes. The 21-year-old Dane has earned around $13 million in prize money during her career, and is estimated to make at least $8 million per year off the court from endorsements. "I think tennis players are actually underpaid, but I might be a little biased. I like to think we are rewarded for the hard work we put in," said Wozniacki, who added that she is in favor of equal prize money.