Clarke played a practice round with Lee Westwood on Tuesday

Clarke will tee off at Augusta on Thursday at 1735 BST.

Donegalman and British Amateur champion Brian McElhinney has landed a daunting draw alongside Tom Watson and US Open champion Michael Campbell.

Paul McGinley has been paired with Fuzzy Zoeller and Charles Howell while Padraig Harrington has Craig Stadler and US amateur Kevin Marsh for company.

Tiger Woods will begin his campaign for a fifth title alongside Australia's Robert Allenby and 2005 US amateur champion Edoardo Molinari.

The world number one tees off at Augusta at 1523 BST on Thursday.

The highest-profile grouping puts Phil Mickelson and Ernie Els together, along with Shingo Katayama, at 1830.

Leading Briton Luke Donald sets out with two-time champion Jose Maria Olazabal and David Toms at 1501, while Colin Montgomerie starts at 1640.

World number two Vijay Singh, who won the 2000 Masters, will tee off with Sweden's Henrik Stenson and American Arron Oberholser at 1512.

And Ryder Cup captains Ian Woosnam and Tom Lehman should have plenty to talk about after being drawn together in a group with South Africa's Tim Clark at 1428.