Only six athletes have ever reached $1 billion or more in career earnings. Tiger Woods ($
1. 72b) Cristiano Ronaldo ($
1. 24b) Lebron James ($
1. 16b) Lionel Messi ($
1. 15b) Roger Federer ($
1. 09b) Floyd Mayweather ($
1. 08b) Who do you think will be next?