Closing in on her 21st birthday, Serena Williams seems to have it all: No. 1 in the world in women's tennis, four Grand Slam singles titles to her credit, 17 victories on the WTA Tour, an Olympic gold medal (in doubles with sister Venus), over $9 million in prize money (plus who knows how much in lucrative endorsement contracts), her own clothing line and -- perhaps most impressive of all -- she and Venus have been featured on the animated hit TV series "The Simpsons."

But recently, the Florida-based tennis phenom has experienced some of the darker sides of fame. At last month's U.S. Open, which Serena won by beating sister Venus in the final, a German fan who had been pursuing Serena across the globe was arrested for stalking. Prior to that, Williams admitted that to avoid being constantly hassled while out in public, she became addicted to Internet shopping, spending up to six hours a day online in her hotel room buying all manner of useless items.

So, does she ever feel like chucking it all, maybe wish she were attending classes at USC or working anonymously in a bank somewhere?