He failed to notice that Tommy Aaron had mistakenly given him a 4 instead of a 3 on No. 17 during the 1968 Masters, turning the Argentine's brilliant 65 into a fateful 66. It's still known as one of the sport's biggest gaffes.
Sports Illustrated's Alan Shipnuck sat down with five-time major winner Phil Mickelson ahead of the CareerBuilder Challenge. Lefty dishes on Tiger Woods, the Ryder Cup, those famed money matches and more.