Until 2017, Jason Day could regularly be seen with Colin Swatton on his bag after the the former Kooralbyn International School golf coach had taken Day under his wing following the death of his father at the age of 12.
That brought incredible success, too, with Day winning 10 times on the PGA Tour between 2010 and their parting of the ways, while he reached World No.1 during that time, too, in 2015.
Swatton stayed on as Day's coach, but for caddying duties, the Australian turned to his former high school roommate, Luke Reardon. Even then, that wasn't a final decision, as Day experimented with other friends on the bag until at the 2019 US Open, Tiger Woods' former caddie Steve Williams was alongside him.
At the time Day said of that move: "I need to start working harder, and that's plain and simple. That started with - this is no disrespect to my mates that were on the bag. They were very, very hard workers. They were great. But I think Steve will take me to that next level, and I'm hoping that's the case."
While that was the anticipation, the partnership clearly didn't work as well as planned as it came to an end after only six weeks. From there, Day returned to Reardon along with another childhood friend, Rika Batibasaga. However, Reardon, who grew up admiring the abilities of Adam Scott and whose favorite course to caddie at is Quail Hollow, now has the job on a permanent basis, having taken it on in 2020.
That's a move Swatton felt had merit. He told AAP: "Putting someone on a more permanent basis is a good move for Jason because he doesn't have to adjust to different styles every other week. Luke is a hard worker and a diligent caddie."
On his decision to opt for the Queenslander full-time, Day said: "Luke has known me since I was in high school. He knows my game very well and he has become a solid caddie."
Ultimately, that's a decision that has reaped rewards, even though success didn't come immediately. Day suffered a slump through much of 2021 and 2022, which saw him drop out of the world's top 100 - a period that coincided with the death of his mother.
Since then, though, it's been mainly up for Day, and with Reardon's assistance, he briefly returned the the world's top 20, helped by his first PGA Tour win for five years at the 2023 AT&T Byron Nelson.
