Jason Day has called time on his successful 20-year partnership with coach Colin Swatton and will instead work on his game alone.

“It’s been a long and successful road working with Col,” Day said in a story posted to pgatour.com in the lead-up to this week’s WGC–FedEx St Jude Invitational in Memphis. “I have just decided I want to make a change and work on my own as it pertains to my golf swing.”

Swatton was instrumental in taking Day to world No.1 and becoming a Major champion at the 2015 PGA Championship. He began working with Day when the Queenslander was aged 12 and still reeling from the loss of his father to cancer.

“Col has been way more than just a caddie and coach to me. I am forever grateful for all he has done for my golf and his continued friendship,” Day told Australian golf writer Ben Everill on pgatour.com.

Swatton, who also served as Day’s caddie for the majority of his career, said he felt fortunate to have had the opportunity to work with the 32-year-old.

“It’s been a privilege to work with Jason since his childhood and I’ll always cherish the ride we’ve shared that took us all the way to the top of the golf world,” Swatton said.

Day’s most recent win came in May 2018 and since then has seen his world ranking dip as low as 63rd as he’s dealt with chronic back issues. A pair of top-10 results in his past two events has seen Day climb back to 43rd.