10 top-earning tennis stars (11 images)

Roger Federer of Switzerland hits a volley to Juan Martin Del Potro of Argentina in the first set of their mens final match in Arthur Ashe Stadium at the US Open Tennis Championships at the Billie Jean King National Tennis Center in New York on September 14, 2009. UPI/John Angelillo

Maria Sharapova serves to Melanie Oudin of the USA in the third set on day 6 at the US Open Tennis Championships at the Billie Jean King National Tennis Center in New York on September 4, 2009. Oudin defeated Sharapova 3-6, 6-4, 7-5. UPI/John Angelillo

Rafael Nadal of Spain, third seed, returns the ball to Fernando Gonzalez of Chile in the third set of their quarter-final match at the US Open Tennis Championship on September 12, 2009 in New York. Nadal won 7-6, 7-6, 6-0. UPI /Monika Graff

American Andy Roddick prepares to hit a shot during his mens semi-final match against Swede Robin Soderling at the BNP Paribas Open in Indian Wells, California on March 20, 2010. Roddick defeated Soderling 6-4, 3-6, 6-3 to advance to the tournament finals. UPI/David Silpa