Two-time WGC-Match Play winner Day, the eighth seed, will also face Jason Dufner and James Hahn in the pool matches at Austin Country Club.

"I'm really looking forward to coming up against Louis again," Day told AAP.

"We had a lot of fun in the 2016 final and we're Presidents Cup teammates.

"It's going to be a tough group and I'm going to have to play three really good matches."

Day, who also won the 2014 edition in extra holes, says he loves the head-to-head combat of match play – where his ranking as the US Tour's No.1 putter is a valued weapon.

"Kicking someone's butt is great, but the most enjoyable thing about match play is coming down the stretch and having to stand up and hit a clutch putt," Day said.

"That is where I get the biggest rush, because in match play there's stress over every putt and I thrive on that.

"Match play is one of my favourite formats, I absolutely love playing it and I look forward to this event every year.

"It's the easiest and the hardest tournament to win; yes it's long and you're playing tough matches against good players but there are only seven guys you have to beat to hold up the trophy."

Leishman says he knows he won’t be seen as the underdog during the group stages but recognises he will still need his best golf to win. PHOTO: Mike Ehrmann/Getty Images.

Day's fellow Australian Marc Leishman, also a top-16 seed, has drawn South Africa's Branden Grace as well as two-time Masters winner Bubba Watson and American Julian Suri.

"I've always done well as the underdog, but I'm probably not going to have that tag this week, at least during the group stages," Leishman told AAP.

"As one of the top seeds, I'm not up against guys like DJ (Dustin Johnson) or Jason (Day) in the group but the reason these guys are on the PGA Tour or the European Tour is because they are the best of the best.

"Bubba is a two-time major winner and 'Gracey' has been a great match player in Presidents Cups.

"I'll have to go into those matches with the mindset that I have to play my best golf to win, otherwise you could get eaten up."

Brisbane native Cameron Smith, the 46th seed, will be pitted against Japanese star Hideki Matsuyama, Patrick Cantlay and Matsuyama's countryman Yusaku Miyazato.

Currently ranked World No.50, Smith needs a strong finish to secure a Masters invitation to Augusta when the field is all but finalised on Monday.

An all-Australian final is also a possibility with Day and Leishman on opposites of the draw, while Smith could face Day in the semi-finals.

GROUPS FOR WGC-MATCH PLAY

* Dustin Johnson, Kevin Kisner, Adam Hadwin, Bernd Wiesberger

* Justin Thomas, Francesco Molinari, Patton Kizzire, Luke List

* Jon Rahm, Kiradech Aphibarnrat, Chez Reavie, Keegan Bradley

* Jordan Spieth, Patrick Reed, Haotong Li, Charl Schwartzel

* Hideki Matsuyama, Patrick Cantlay, Cameron Smith, Yusaku Miyazato

* Sergio Garcia, Xander Schauffele, Dylan Frittelli, Shubhankar Sharma

* Rory McIlroy, Brian Harman, Jhonattan Vegas, Peter Uihlein

* Jason Day, Louis Oosthuizen, Jason Dufner, James Hahn

* Tommy Fleetwood, Daniel Berger, Kevin Chappell, Ian Poulter

* Paul Casey, Matthew Fitzpatrick, Kyle Stanley, Russell Henley

* Marc Leishman, Branden Grace, Bubba Watson, Julian Suri

* Tyrrell Hatton, Charley Hoffman, Brendan Steele, Alexander Levy

* Alex Noren, Tony Finau, Thomas Pieters, Kevin Na

* Phil Mickelson, Rafa Cabrera-Bello, Satoshi Kodaira, Charles Howell III

* Pat Perez, Gary Woodland, Webb Simpson, Si Woo Kim

* Matt Kuchar, Ross Fisher, Yuta Ikeda, Zach Johnson

- Evin Priest, Australian Associated Press