The ban on anchored putters officially came into effect on January 1, 2016, following a lengthy struggle over its legality.
Any players still using the 'belly' putter will have to make another plan from now on.
Long putters may still be used, but they can no longer be pressed into a golfer's midsection for greater control.
The ban was first proposed jointly by the Royal & Ancient Golf Club and U.S. Golf Association more than three years ago following much deliberation.
It was swiftly approved and has now been written into the Rules of Golf.
Rule 14-1b states: "In making a stroke, the player must not anchor the club, either 'directly' or by use of an 'anchor point.'"
During the time the anchored putters were allowed, several players enjoyed considerable success using them.
Adam Scott, Ernie Els and Keegan Bradley all won majors while using the elongated flat stick.
Before his Open Championship victory, Els famously maintained, "As long as it's legal, I'll keep cheating like the rest of 'em."
Even Phil Mickelson briefly tried out the new approach, though Tiger Woods remained opposed to the method throughout.
"Anchoring should not be a part of the game," he said back in 2013 before the ban was approved. "It should be mandatory to have to swing all 14 clubs."
The US President was among the viewers watching the TaylorMade Driving Relief.
The US President phoned in as McIlroy played in a Sunday fundraiser for coronavirus victims.
Syme donated his prize money to charity.
‘This is the life of a caddie…’
The Northern Irishman is ranked number one in the world.
Players entering the United States will face a 14-day quarantine period, while a strict testing regime will be in place at each tournament.
The experienced duo will be involved at Whistling Straits.
The world number 98 intends to split the 10,000 euros prize money between his own charity and a hospital in his native Rotterdam.
The biennial event between Europe and the United States is scheduled to take place from September 25-27.