4. Jack Nicklaus: $320 million
Many believe American golfer Jack Nicklaus to be the best golfer of all time, and his wallet reflects is: his estimated net worth is $320 million. Nicklaus won 18 major championships, setting a record not broken for 25 years.
Nicklaus has also competed in 164 major championships, more than any player in golf history. He is one of only five to have won every major championship: six times at the Masters, five times at the PGA Championship, four times at the U.S. Open, and three times at the Open Championship.