17 July 2011 16:00 GMT

Darren Clarke holds on to his two-shot lead after 12 holes of the final round, but his nearest challenger is now Dustin Johnson. He has responded with birdies at the 10th and 12th to dropped shots early in the round and now has playing partner Clarke firmly in his sights.

Three shots from the edge of the 13th green, missing from six feet, dropped Phil Mickelson back to four under. At exactly the same moment Clarke was holing a putt of the same length to save his par on the 11th.

The Irishman played brilliantly from tee to green yesterday and putted poorly, missing a clutch from close range. Today he has maintained his long game and is putting with regained confidence. It could be the key to a long-awaited victory.