For starters, Mickelson was not aware of the one-ball rule in fourballs and singles matches, meaning that players can't change the model of their golf ball during the match. It turned out to be a costly mistake when Mickelson and Zach Johnson halved their fourballs match with Jason Day and Adam Scott, and that allowed the International team to pull within one point of the Americans going into Saturday. There's rarely a dull moment around Mickelson, and that was the case Friday at the Jack Nicklaus Golf Club Korea. More...