Two-time defending champion Tiger Woods had a shaky start to his round in his quest to win this event for a third straight year and fourth overall. The top player in the world dropped a shot at the first and after a bogey at the third saw him fall back to 1-under, the possibility of not playing the weekend surfaced.
Woods was not prepared to let that happen, however, and picked up his first birdie of the day at the seventh. He added a birdie at the 13th to reach 3-under and rolled in a five-foot putt for a birdie at the 17th on his way to a round of 71.
The 27-year-old now stands at 4-under-par 140, nine shots behind Harrington. No deficit is great enough for Woods, however. He trailed by 10 strokes at the halfway point of this event in 2001 and went on to win by four.
'Without at a doubt Tiger can win this tournament, but two things will probably have to happen,' said Harrington. 'It would take him to play well and for me not to repeat the scores of the first two days.'
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By the time Harrington teed off at Gut Kaden, Goosen had completed a round of 69 that gave him the clubhouse lead at 10-under. Harrington, coming off a near win at the International Open last week, seemed to start slowly until a birdie at the sixth.
At the par-4 ninth, Harrington dropped his approach inside 10 feet for another birdie. He then birdied the 10th and hit his second shot to four feet at the par-4 11th to make it three in a row and take the outright lead.
Harrington continued his fine play at the par-5 15th where he chipped his third shot from off the green to within a foot of the cup for a birdie. At the par-3 16th, Harrington missed the green off the tee but managed to chip in for his sixth birdie of the day.
The Irishman then parred the two remaining holes to complete his second bogey- free round of the tournament.
'Over the weekend I will try to keep focused on what I'm doing and try to get a better result than last week,' said Harrington. 'I worry about myself more than anyone else. I don't wake up at night or anything like that, but I do think too much.'
Goosen, who is seeking his first victory of the season, got off to an almost identical start as his first round. He birdied his first three holes on Thursday and after a par at the 10th, his first on Friday, the South African ran off another stretch of three straight birdies.
He stumbled with two bogeys for his next five holes but recovered on the inward half. Goosen reached the green in two at the par-5 third and his eagle try bounced off the edge of the cup. He converted the birdied put but missed the green at the fifth en route to a bogey.
Goosen responded with a birdie at the very next hole and sent his second shot from the rough at the ninth to 12 feet. The 2001 U.S. Open champion drained the putt for sixth his birdie of the day.
'I started pretty nicely but hit some bad iron shots and eventually got it back near the end,' said Goosen.
Graeme McDowell of Northern Ireland fired a 65 to finish four shots off the lead at 9-under-par 135. He was joined by Sweden's Robert Karlsson, Peter O'Malley of Australia and Scotland's Andrew Coltart in a tie for third.
Paul Casey, who captured last week's International Open at The Belfry, posted a 66 to finish one shot further back alongside Paul Lawrie, Peter Lawrie, Peter Baker, Raphael Jacquelin and Darren Clarke at 8-under-par 136.
The 36-hole cut fell at 2-under-par 142 with 77 players qualifying for the weekend. Among those who didn't make the grade were Adam Scott, Lee Westwood, Paul McGinley and Ty Tryon.