There are many times no ways to explain it.
Other times, it's a swing change, an equipment change or a procedure designed to fix an ailing body.
But more often than not, a sudden resurgence in a golfer's career is a mysterious thing.
Players who ordinarily struggled to be average or just above average suddenly find themselves in contention—and, in the case of moving from the PGA Tour to the Champions Tour, becoming a dominant player.
Check out this list of names and see if there's a real good reason for the change.