The 16 groups are set for this week's World Golf Championships-Cadillac Match Play.
The random draw for the final three spots in each group -- with the top 16 seeds leading each group -- was held Monday. Top overall seed Rory McIlroy has a star-studded group with another major winner (Jason Dufner) and two FedExCup champions (Billy Horschel and Brandt Snedeker).
No. 2 seed and Masters champ Jordan Spieth also faces a tough
challenge with veteran Ryder Cupper Lee Westwood in his group. Westwood
is fresh off a win in Indonesia and reached the semifinals in this event
three years ago.