Colin Swatton says Jason Day can now aspire to dominate the golf world like Greg Norman and Tiger Woods before him.
Day's caddie, coach and long-time mentor says Day can become the greatest Australian golfer ever now he's won his first major and climbed the mountain to world No.1.
"I want to see him solidify the No.1 position, I want to see him continue to grow and I want to see him do what I believe he can and that is dominate," Swatton told AAP.
"I think he can be another Greg Norman or even another Tiger Woods in the sense he can dominate his competitors, I think he is that good a golfer."
At just 27 Day has time, but has a long way to go to match Peter Thomson's five majors - the most won by an Australian - or the 331 weeks Norman, who won two majors, spent as world No.1.
Only David Graham has won two different majors and Day wants all four.
He has the marks firmly in his crosshairs.
"I'd love to win all the majors, get the career grand slam would be fantastic," Day said.
"Now I am at No.1 I'm happy, I am proud of the achievement. But it is not the end. This is the start of a new chapter. And now I have to strive to stay there. The only way to do that is keep winning.
"And the way to keep winning is keep on putting in the hard work. Greg Norman spent over six years of his life at No.1, Tiger more than double that and I'm here for one week. There is a long road ahead to even be considered near those guys."
Day lines up at the season-ending Tour Championship in a position to win a fifth tournament in seven starts and a sixth for the year.
If he does he will also take out the lucrative FedEx Cup and obscene $US10 million ($A14.11 million) bonus, taking his on course earnings up and over the $US20 million ($A28.22 million) mark in 2015 alone.
He can mathematically win the bonus even if he finishes last in the 29-man field - Jim Furyk has withdrawn with a wrist injury - depending on others, but does not want to rely on them.
Another victory would also continue to flare up the debate on Player of the Year, which is a two-horse race between Day and Jordan Spieth.
Spieth has four wins this season, but two were the Masters and US Open while Day has five, with one major and two playoff events.
Spieth was also one shot out of the playoff at the British Open and second to Day at the PGA Championship in one of the great major championships seasons of all time.
Two-time Masters winner Bubba Watson said he'd lean towards Day if the Australian wins again but multiple players believe the two majors from Spieth trumps everything.
"I like being in the conversation," Day says.
"It means I've had a good year. Hopefully I can continue that this week."
Steven Bowditch is the only other Australian in the field, ranked 24th, with a minimal chance to win it all.
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