Immelman moves clear as Casey fades

While South African Trevor Immelman overcame a nervy start and was on track to win his first major title - he led American Brandt Snedeker and Steve Flesch by four after seven holes of his final round - it all started to go wrong for Casey on the short fourth.

When he birdied the third with a superb pitch to three feet in the difficult conditions Casey was in joint third place with left-hander Flesch. But then he took two to get out of a greenside bunker, double-bogeyed and promptly bogeyed the next three holes.

It was during that run that he called a penalty on himself when his ball moved after he had addressed it on the sixth green - the second time that had happened to a player during the tournament.

Down to three under par and nine adrift of Immelman, Casey was in a tie for sixth with Open champion Padraig Harrington, who threatened to get into contention when he birdied the second and third, but then followed five successive pars with a bogey on the ninth.

Tiger Woods, meanwhile, was still waiting to ignite his last-day bid for a fifth green jacket, 14th major and, of course, the first leg of a Grand Slam he described in January as "easily within reason".

Six behind at the start of play he missed a three-footer to bogey the fourth, got it back with an iron to five feet at the sixth, but failed to birdie either of the two par-fives on the front nine.

Woods was five under and joint fourth with Stewart Cink.

Snedeker was Immelman's closest challenger overnight and after matching the Cape Town golfer's bogey on the first he jumped alongside him with a 30-foot putt on the next for only the second eagle there of the tournament.

However, Snedeker bogeyed the next and let further shots go on the sixth and seventh.