13. Bjorn Borg:
The Swedish Borg had no rival in the sport of tennis during his prime. He became the first man to win 11 Grand Slams in singles competition. He did just that from 1971, bringing home six French Open titles and five Wimbledon championships. He’s also credited with singlehandedly causing a surge in the popularity of tennis during the 1970s. As a result, he also became the first tennis player to earn one million dollars in a single season in 1979.
But like Justine Henin, the never-ending grind of pro tennis eventually caught up to Borg. He was a teen sensation whose rise to fame was dissected under a public microscope. The spotlight and pressure of being such a prominent star forced Borg to burn out at a young age. Because of this, he announced his retirement from the sport at only 26 years old. He’s still considered one of the greatest tennis players of all-time. Borg launched a highly successful fashion label in his native Sweden after retiring.