10. Jack Nicklaus: The Golden Bear is not, by any definition, Tiger’s enemy. But nemesis? Certainly. Tiger’s knowledge of golf’s history is locker room legend. Earl Woods may have predicted his son would win 14 majors, but who believes he didn’t really have the record in mind? That’s the thing with Tiger and Jack: The game’s two greatest players can cozy up in public. They can, and should, admire each other’s work. But at the end of the day, each wants his name on the record book’s top line. And that’s makes a perfect nemesis.