THE STORY
In the final round of the 2010 PGA Championship at Whistling Straits, Dustin Johnson grounded his club in a sandy area adjacent to the 18th fairway, unaware it was designated as a bunker. This resulted in a two-stroke penalty, turning his score from a potential playoff-qualifying 71 into a 73, and he finished tied for fifth. (espn.com)
TEAMS / PEOPLE:
Dustin Johnson
WHY IT MATTERS
The incident sparked debate over course markings and the clarity of local rules, leading to changes in course design to prevent similar confusion in future tournaments. (espn.com)