Dustin Johnson And His Caddie Have Been Studying New Rules.

Dustin Johnson and his caddie spent the entire off-season…

Dustin Johnson and his caddie spent the entire off-season studying golfs new rules As golf fans are well aware, Dustin Johnson has had two of the more famous rules run-ins in recent golf history.

There was the accidental grounding of his club in a waste bunker that cost him the 2010 PGA Championship and the accidental micro-moving of his golf ball that nearly cost him the 2016 U.S. Open.