Currently, the highest paid athlete in the world is Floyd Mayweather Junior, with an annual salary of $75.5 million. The second highest paid athlete is Christiano Ronaldo, with an annual salary of $50 million.
Yes, surprisingly enough, the highest paid athlete of all-time is a Roman horse. A Roman charioteer named Gaius Apuleius Diocles earned the equivalent of over $15 billion over a 24-year career, giving him the title of the highest-paid athlete of all time.
That would be Tiger Woods, one of the world's top golfers, from 2001 through 2009 he was the highest paid athlete, during that time his income was well over two time greater than the second highest paid athlete.