Mayweather, Jr., who has earned the nickname 'Money' for his high-earning, lavish lifestyle, has ended Woods' decade-long reign on Forbes magazine's rich list thanks to two lucrative fights with Victor Ortiz and Miguel Cotto in the past year, which have earned him an estimated $85 million (£53 million).
Woods ranks third on the new countdown with estimated 2011/2012 earnings of $59.4 million (£37.1 million).
Mayweather, Jr.'s chief rival, Manny Pacquiao, comes in second on the Forbes list with earnings of $62 million (£39 million).
Only two women make the top 100 - Maria Sharapova ranks number 26 and fellow tennis ace Li Na comes in at 81.
Mayweather, Jr. checked into prison in May (12) for a three-month stint for a domestic violence charge.