Darren Clarke has had another remarkable day at Augusta and pulled within four of leader Chad Campbell.

The Ulsterman, who had said he'd be treating the tournament as a holiday, came back from a bogey at the seventh to birdie the next two and take himself to one-under.

He could have climbed even higher than his share of seventh but for a missed birdie opportunity on the 13th. His approach shot into the creek and he did well to make a par five after taking a penalty drop.

Clarke's 70 adds to his opening 72 to make him just one of just a handful of players in the clubhouse under par.

A double bogey seven — his second of the week — and a late three-putt bogey left Colin Montgomerie in severe danger of missing the halfway cut for the fifth event running.

Padraig Harrington continued his superb recovery from being five-over after seven yesterday.

The Dubliner was up to level par when he birdied the long eighth. He did then bogey the ninth, but then came a birdie at the 13th.

Rocco Mediate and world number three Retief Goosen were joint third on three-under, while Phil Mickelson and Mike Weir, the two left-handers to have won the title, were one further back.

Lee Westwood was almost certain to bow out. Setting off again on three-over the Worksop golfer double-bogeyed the 10th and with one to go stood six-over.

For the second day running, Luke Donald - third last year - bogeyed the first. When he made four on the second, though, he returned to two-over.