9. Old Man Time: Woods was a wispy twenty-something when he took over the Tour. That kid grew up (and bulked up) into a 37-year-old with bad knees and an ailing Achilles, neck and elbow issues and a medical history that includes torn cartilage, sprained ACLs, and a fractured tibia. Blame his swing, blame his training, blame Old Man Time. Either way, Woods is limping towards Nicklaus’ major mark slower than anyone expected, and skeptics say time is running out.