Maria Sharapova
Earnings: $27.1 million
2011 ranking: 1
2011 earning: $25 million
Her French Open title in June completed a career Grand Slam—the sixth women to accomplish the feat in the Open era. Her Nike deal is the richest in women's tennis. Sales for her Maria Sharapova Collection, which include shoes and accessories for Nike subsidiary Cole Haan, doubled in 2011.