Jason Day will face a rematch of his 2016 final win over Louis Oosthuizen in the group stage of this week's World Golf Championships-Match Play event in Texas.
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.
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.
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
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