Day recently split with Canberra-native Swatton, the swing guru who coached him from a prodigious teenager at a Queensland boarding school to a dominant World No.1 and major champion.

But without a win in more than two years, Day decided he will monitor his own golf swing and the move has sparked an electric return to form.

Day recorded three consecutive top-10s on the PGA Tour for the first time in four years before threatening to win last week's US PGA Championship, where he finished tied fourth.

The 32-year-old has clawed back up the world rankings to No.32 and Swatton says Day's hot form will continue.

"He's taken responsibility for his game and his swing," Swatton told AAP of the pair's split.

"He is super motivated to get back to World No.1 and it won't surprise me if he gets there.

"Four top-10s and contending in the first major of this year, I think, is a sign of things to come."

Day, who as a child lost his father to stomach cancer, has considered Swatton a father figure since meeting him at Queensland's Kooralbyn International School.

β€œHe is super motivated to get back to World No.1 and it won't surprise me if he gets there.” – Colin Swatton

"It was Jason's work ethic that was always going to make him successful," Swatton said.

"I saw that, even at the age of 14, he was prepared to work harder than anybody else."

Swatton was also Day's caddie until September 2017 and helped him to 10 of his 12 PGA Tour victories, including a major at the 2015 US PGA Championship, as well as 51 weeks as World No.1.

"There's no disappointment at all," Swatton said.

"The biggest compliment you can get as a coach from a player is for them to feel they've been given the knowledge and skills to perform."

Day and fellow big-name Australians Adam Scott, Marc Leishman and Cameron Smith will sit out this week's Wyndham Championship – the final event of the PGA Tour's regular season.

Due to COVID-19 forcing a 90-day shutdown of the US Tour, no players will lose their exempt status if they finish outside the top 125 on the FedEx Cup points race.

However, those inside 125 still advance to a three-event playoffs series with the full US$70 million prize pool being paid out.

Australians in the Wyndham field are Matt Jones (87th in FedEx Cup points), Cameron Davis (102nd), Cameron Percy (140th), Aaron Baddeley (156th), Rhein Gibson (190th), John Senden (232nd) and Greg Chalmers (245th).

- Evin Priest, Australian Associated Press