JASON Day has become the latest high-profile golfer to split with a long-term caddie.
The 29-year-old has told mentor and father figure Colin Swatton he no longer wants him on the bag after a form slump saw the Australian drop from world No.1 to ninth on the rankings.
Day acknowledged that Swatton had been a "bit shocked" at the news but said he had taken it like a professional.
"Unfortunately it just didn't work out," Day told the Golf Channel on the eve of the BMW Championship at Conway Farms, outside Chicago.
"I'm trying to find my footing here. I had to do it at some point."
Day's hot streak saw him become the world's best player for the second half of 2015 and the first part of 2016.
He also won his first major at the PGA Championship, but has struggled in relative terms lately.
Day, who plans to use a friend, Luke Reardon, on the bag this week, said he planned to keep Swatton as his coach.
"He's just coming off the bag and going to more of a coaching role," he said.
"He's not out of my world one bit. I'm hoping things move forward with us like they always have ... because we both love each other like family."
Day was 12 years old when he met Swatton at an Australian golf academy, and the Aussie has often said he would not be where he is without his mentor.
Swatton even played matchmaker by introducing Day to his now-wife, Ellie.
The news comes a month after another former world number one, Rory McIlroy, dumped his caddie, JP Fitzgerald.
In June, five-times major champion Phil Mickelson parted with Jim Mackay after 25 years.