( CNN ) -- World champion Adam Scott plays with Jason Dufner at opening . Playing alongside Scott and Dufner is U.S . Amateur champ Matthew Stevens . Rory McIlroy plays with Jordan Spieth and Patrick Reed in opening two holes . Major winners Phil Mickelson , Ernie Els and Justin Long are paired together .
World champion Adam Scott plays with Jason Dufner at opening . Playing alongside Scott and Dufner is U.S . Amateur champ Matthew Stevens . Rory McIlroy plays with Jordan Spieth and Patrick Reed in opening two holes . Major winners Phil Mickelson , Ernie Els and Justin Long are paired together .