Darren Clarke one down after four holes

Latest positions in the first round of the World Golf Championships-Accenture match play championship at La Costa, Carlsbad, California

(seeded positions in brackets):

(9) Chris DiMarco 3 down to (56) Toshi Izawa (after 14 holes),

(24) Eduardo Romero 1 up on (41) John Huston (14),

(12) Rocco Mediate 2 up on (53) Shingo Katayama (13),

(21) Bernhard Langer 1 down to (44) Adam Scott (12),

(10) Jim Furyk level with (55) Len Mattiace (10),

(23) Rich Beem 1 down to (42) Steve Lowery (9),

(11) Colin Montgomerie 2 down to (54) Alex Cejka (9),

(22) Angel Cabrera 1 up on (43) Scott Verplank (8),

(8) Padraig Harrington 3 up on (57) John Cook (8),

(25) Scott Hoch 1 up on (40) Tom Lehman (7),

(5) Sergio Garcia 1 up on (60) Kevin Sutherland (6),

(28) David Duval 2 up on (37) Justin Rose (6),

(7) Davis Love 3 up on (58) Paul Casey (5),

(26) Darren Clarke 1 down to (39) Tim Clark (4),

(6) David Toms level with (59) Anders Hansen (4),

(27) Stuart Appleby 2 down to (38) Chris Riley (3),

(16) Justin Leonard level with (49) Jose Maria Olazabal (2),

(17) Bob Estes level with (48) Stephen Leaney (2),

(13) Nick Price 1 up on (52) Paul Lawrie (2),

(20) Charles Howell level with (45) Niclas Fasth (1)