Golfers Tiger Woods and Phil Mickelson and former NBA player Michael Jordan are among the 20 wealthiest American celebrities, Forbes reported on Wednesday. Woods, 40, is the youngest person on the Forbes top-20 list, with a net worth estimated at $740 million. The 14-times major champion, who trails only Jack Nicklaus (18 majors) on the all-time list, recently launched a competitive comeback after being sidelined for more than 15 months while recovering from back surgery. More...