Total earnings: $15.7 million

Prize money: $6.7 million

Endorsements: $9 million

Azarenka's $7.9 million prize money haul in 2012 was a single year record for a female athlete in any sport (we credit her with $6.7 million between June 2012 and June 2013). She won her second straight Australian Open in January. Endorsement partners include Nike, Wilson, American Express, Six Star Pro Nutrition, InstaForex and Citizen Watch. Red Bull inked her to a deal in January, which made her the first tennis player sponsor for the beverage giant.

Victoria Azarenka of Belarus hits a return to Maria Joao Koehler of Portugal in their women's singles tennis match at the Wimbledon Tennis Championships, in London, June 24, 2013. [Photo/Agencies]