In this slideshow, we explore the 15 wealthiest athletes in history who have not only excelled in their sports, but have also amassed billion-dollar fortunes. Join us as we explore their impressive legacies and the records they’ve set along the way. The following net worths are estimated based on our research. Michael Jordan: $3.75 Billion, Basketball, United States Tiger Woods: $1.3 Billion, Golf, United States LeBron James: $1.2 Billion, Basketball, United States Cristiano Ronaldo: $800 Million, Soccer, Portugal Arnold Palmer: $875 Million, Golf, United States Lionel Messi: $850 Million, Soccer, Argentina Jack Nicklaus: $400 Million, Golf, United States David Beckham: $450 Million, Soccer, United Kingdom Roger Federer: $550 Million, Tennis, Switzerland Floyd Mayweather: $400 Million, Boxing, United States Phil Mickelson: $300 Million, Golf, United States Michael Schumacher: $600 Million, Formula 1, Germany Shaquille O’Neal: $500 Million, Basketball, United States At the time of his death, Kobe Bryant was worth an estimated $600 million. Greg Norman: $400 Million, Golf, Australia