Dustin Johnson sparked a big argument between Jack Nicklaus and the USGA in 2016.
Johnson's US Open win was almost marred by a penalty decision.
What happened at the 2016 US Open
On the fifth hole of his final round at Oakmont, Johnson's ball moved slightly after he stepped away from a putt.
A rules official told him all was fine, but the USGA's Craig Winter believed there was a violation.
Why Jack Nicklaus got involved
Nicklaus, a huge admirer of Johnson, sought out USGA chief Mike Davis at Royal Troon to express his disagreement with the USGA's handling of the situation.
Nicklaus said the USGA should have penalized Johnson immediately or not at all.
The outcome
Johnson finished on five-under par, four clear of Shane Lowry, Scott Piercy, and Jim Furyk, despite being handed a one-stroke penalty.
The USGA's decision was widely criticized by high-profile players, including Jordan Spieth.
Dustin Johnson has won 24 PGA Tour titles and two major championships.
He experienced heartache before his first major win, including a two-stroke penalty at the 2010 PGA Championship.
The USGA's Mike Davis later contacted Nicklaus and admitted the mistake.
Nicklaus's argument with the USGA highlights the controversy surrounding Johnson's 2016 US Open win.
Dustin Johnson's career has been marked by ups and downs, but his 2016 US Open win remains a notable achievement.
The argument between Nicklaus and the USGA adds a new layer to the story of Johnson's win.