Serena Williams

3. Tennis player

Tennis Star

In 1995, Serena turned pro. Two years later, she was already No. 99 in the world rankings—up from No. 304 just 12 months before. A year later, she graduated high school, and almost immediately inked a $12 million shoe deal with Puma. In 1999, she beat out her sister in their race to the family's first Grand Slam win, when she captured the U.S. Open title.

With their signature style and play, Venus and Serena changed the look of their sport as well. Their sheer power and athletic ability overwhelmed opponents, and their sense of style and presence made them standout celebrities on the court.

In 2002, Serena won the French Open, the U.S. Open, and Wimbledon, defeating Venus in the finals of each tournament. She captured her first Australian Open in 2003, making her one of only six women in the Open era to complete a career Grand Slam.  In 2008, she won the U.S. Open and teamed with Venus to capture a second women's doubles Olympic gold medal at the Beijing Games.

But Serena also had her losses. She underwent knee surgery in August 2003, and in September her half-sister Yetunde Price was murdered in Los Angeles, California. Three years later, Serena seemed burned out. Bitten by injuries, and just a general lack of motivation to stay fit or compete at the same level she once had, Serena saw her tennis ranking slump to 139.

Serena credited her faith as a Jehovah's Witness, as well as a life-changing journey she made to West Africa for renewing her pride and competitive fire. By 2009 Serena won both the 2009 Australian Open singles (for the fourth time) and Wimbledon 2009 singles (for the third time). She also won the doubles matches at both the Australian Open and Wimbledon that year.

At the 2012 Summer Olympic Games, Serena beat Maria Sharapova to take her first gold medal in women's singles. The next day, she claimed her fourth overall Olympic gold medal by teaming with sister Venus to defeat Czech Republic stars Andrea Hlavackova and Lucie Hradecka in women's doubles.

In June 2013, Williams took her second French Open title—as well as her 16th Grand Slam singles title over defending champion Sharapova. "I'm still a little bit upset about that loss last year," Williams said in an interview with ESPN following the match. "But it's all about, for me, how you recover. I think I've always said a champion isn't about how much they win, but it's about how they recover from their downs, whether it's an injury or whether it's a loss."

"When I was a little girl, in California, my father and my mother wanted me to play tennis," she told the crowd in French after her victory. "And now I'm here, with 20 Grand Slam titles."