Power 100 rank: 25
Rank last year: 18
Most recent notable achievement: Runner-up in 2011 U.S. Open
Key sponsors: Nike, Wilson, HP, Mission Skincare, Kraft
Why she’s on the list: Though Serena struggled with injuries last year, she managed to make it to the finals of the U.S. Open, a tournament she first won at age 17, in 1999. During her career, she has won 27 Grand Slam titles and two Olympic gold medals, among just a few of her on-court achievements. She also maintains a high profile off the court with her own collection of handbags, guest-star spots on television, a stake in the Miami Dolphins, and charity work.
Photograph by Nicolas Asfouri/AFP/Getty Images